The following is a conversation with Gustaaf sourced from he's the chief research and development officer, Spotify leading their product design, data technology and engineering teams, as I've said before, and that research and in life in general, I love music, listening to it and creating it and using technology, especially personalization through machine learning to enrich the music, discovery and listening experience. That is what Spotify has been doing for years, continually innovating, defining how we experience music as a society in a digital age.

That's what Gustaaf and I talk about, among many other topics, including our shared appreciation of the movie to romance, in my view, one of the great movies of all time. This is the artificial intelligence podcast. If you enjoy it, subscribe on YouTube. Give me five stars on iTunes, support on Patreon or simply connect with me on Twitter at Lux. Friedman spelled F.R. IDM. And and now here's my conversation with Gustaaf Soderstrom.

Spotify has over 50 million songs in its catalog, so let me ask the all important question. I feel like you're the right person to ask what is the definitive greatest song of all time? It varies for me personally. So you can't speak definitively for everyone.

I wouldn't believe very much in machine learning if I did. Right, because everyone has the same taste.

So for you, what is it you have to pick? What is the song? It's it's pretty easy for me. There was this song called You're So Cool Honsinger soundtrack to True Romance. It was a movie that made a big impression on me and it's kind of been following me through my life. Actually had to play at my wedding. I sat with the organist and helped him play it on an organ, which was a pretty, pretty interesting experience.

That is probably my, I would say top three movie of all time. Yeah, it's just an incredible movie.

And it came out during my formative years. And as I've discovered in music, you shape your music taste during those years. So it definitely affected me quite a bit. Did it affect you in any other kind of way? Well, the movie itself affected me back then. It was a big part of culture. I didn't really adopt any characters from the movie, but it was a it was a great story of love, fantastic actors. And, you know, really, I didn't even know who it was at the time, but fantastic music.

And so that song has followed me and the movie actually has followed me throughout my life. That was Quentin Tarantino actually, I think directed, directed and produced that are so it's not Stairway to Heaven or Bohemian Rhapsody.

So those are those are great. They're not my personal favorites. But but I realize that people have different tastes. And that's that's a big part of what we do. Well, for me, I have to stick with Stairway to Heaven. So thirty five thousand years ago, I looked it up on Wikipedia. Flute like instrument started being used in caves as part of hunting rituals in primitive cultural gatherings, things like that. This is the birth of music.

Since then, we had a few folks Beethoven, Elvis, Beatles, Justin Bieber, of course, Drake. So in your view, let's start like high level philosophical. What is the purpose of music on this planet of ours?

I think music has many different purposes. I think there is there's certainly a big purpose, which is the same as entertainment, which is escapism, and to be able to live in some sort of other mental state for a while. But I also think the opposite of escaping, which is to help you focus on something you are actually doing, as I think people use music as a tool to to tune the brain to the activities that they are actually doing.

And it's kind of like in one sense, maybe it's the wrong signal. If you if you think about the brain, that's neural networks, that's maybe the most efficient hack we can do to actually actively tune it into some state that you want to be. You can do it in other ways. You can tell stories to put people in a certain mood. But music is probably very effective to get you to a certain mood very fast. I think, you know, there's there's a social component historically to music where people listen to music together.

I was just thinking about this, that to me, you mentioned machine learning. But to me personally, music is a really private thing. I'm speaking for myself. I listen to music like almost nobody knows the kind of things I have in my library except people who are really close to me and they really only know a certain percentage, just like some weird stuff that I'm almost probably embarrassed by. Right. Called the guilty pleasure. Everyone else that the guilty pleasures.

Yeah, hopefully they're not too bad, but it's just for me it's personal. Do you think of music as something that's social or is something that's personal? This is very so I think it's the same it's the same answer that you use it for, for both. We've thought a lot about this during these ten years at Spotify. Obviously, in one sense, as you said, music is incredibly social. You go to concerts and so forth. On the other hand, it is your your escape.

And everyone has these things are very personal to them. So what we found is that when it comes to to most people claim that they have a friend or two that they are heavily inspired by and that they listen to us. I actually think music is very social, but in a smaller group setting, it's in it's an intimate form of it's an intimate relationship. It's not something that you necessarily share. Only now at concerts, you can argue you do, but then you've gathered a lot of people that you have something in common with, I think this broadcast sharing of music is something we tried on social networks and so forth.

But it turns out that people aren't super interested in what their friends listen to. They're interested in understanding if they have something in common, perhaps with a friend, but not not just as information that that's really interesting. I was just thinking this morning, listening to Spotify, I really have a pretty intimate relationship with Spotify, with my playlists. Right. I've had them for many years now and have grown with me together. There's there's an intimate relationship you have with a library of music you've developed.

And we'll talk about different ways to play with that. Can you do the impossible task and try to give a history of music listening from your perspective, from before the Internet and after the Internet and just kind of everything leading up to streaming and Spotify and so on?

I'll try. It could be a 100 year podcast. I'll try to do a brief version. There are some things that that I think are very interesting during the history of music, which is that before recorded music, you to be able to enjoy music, you actually had to be where the music was produced because you couldn't you couldn't record it and time shifted. Creation and consumption had to happen at the same time, basically concerts. And so you either had to get to the nearest village to listen to music.

And while that was cumbersome and it severely limited the distribution of music, it also had some different qualities, which was that the creator could always interact with the audience. It was always like them. And also there was no time cap on the music. So I think it's not a coincidence that these early classical works, they're much longer than the three minutes. The three minutes came in as a restriction of the first wax disc that could only contain a three minute song on one side.

Right. So actually, the recorded music severely limited the output constraints. I won't say limit. I mean, constraints are often good, but it put constraints on the music format. So you kind of said like instead of doing this opus, like many, you know, tens of minutes or something, now you get three and a half minutes because then you're out of wax on this disc. But in return, you get an amazing distribution. Your reach will widen.

Just on that point real quick, without the mass scale distribution, there's a scarcity component where you kind of look forward to it. But we had that. It's like the Netflix versus HBO, Game of Thrones. You, like, wait for the event because you can't really listen to it. Do you, like, look forward to it? And then it's derived perhaps more pleasure because it's more rare for you to listen to a particular piece. You think there's value to that scarcity?

Yeah, I think that that is definitely a thing. And there's always this component of if you have something in infinite amounts, will you value it as much? Probably not. Humanity is always seeking some is relative. They're always seeking something you didn't have. And when you have it, you don't appreciate as much. So I think that's probably true, but I think that's why concerts exist. So you can actually have both. But I think that if you couldn't listen to music in your car driving, that would be worth that.

Costs would be bigger than the benefit of of the anticipation, I think, that you would have. So, yeah, it started with live concerts then being able to, you know, the phonograph invented right there. You start to be able to record music. Exactly. So then then you got this massive distribution that that made it possible to create two things. I think, first of all, cultural phenomenons. They probably need distribution to be able to happen.

But it also opened access to, you know, for a new kind of artist. So you started to have these phenomenon's like Beatles and Elvis and so forth. They were really a function of distribution, I think, obviously of talent and innovation. But there was also technical component. And of course, the next big innovation to come along was was radio, broadcast radio. And I think radio is interesting because it started not as a music medium and started us as an information medium for news.

And then radio needed to find something to fill the time with so that they could honestly play more ads and make more money. And music was free. So so then you had this massive distribution where you could program to people. I think those things, that ecosystem is what created the ability for for for hits. But it was also very broadcast medium. So you would tend to get these massive, massive hits, but. Maybe not such a long tail in terms of choice of everybody listen to the same stuff.

Yeah, and as you said, I think there are some social benefits to that. I think, for example, there is there's a higher statistical chance that if I talk about the latest episode of Game of Thrones, we have something to talk about. Just statistically in the age of individual choice, maybe some of that goes away. So I, I do see the value of like shared cultural components, but also obviously love personalization. And so let's catch us up to the Internet.

So maybe Napster. Well, first of all, there's a through these exact tapes, CDs. There was a digitization of music with a CD. Really, it was physical distribution, but the music became digital. Yeah. And so they were files, but basically box software, to use a software analogy. And then you could start downloading these files. And I think there are two interesting things that happen back to music. Used to be longer before it was constrained by the distribution medium.

I don't think that was a coincidence. And then really the only music started to have developed mostly after music was a file again on the Internet is EDM and EDM is often much longer than the traditional. I think I think it's interesting to think about the fact that music is no longer constrained and minutes per song or something. It's a it's a legacy of an old distribution technology. And you see some of this new music that breaks the format. Not so much as I would have expected actually by now, but but it still happens.

So first of all, I don't really know what EDM electronic dance music. Yeah, you could say Avichai was one of the biggest in this genre. So the main constraint is of time, something like three, four or five minutes long. So you have songs that were eight minutes, 10 minutes and so forth because it started as a digital products that you downloaded. So you didn't have this constraint anymore. So I think it's something really interesting that I don't think has fully happened yet or kind of jumping ahead a little bit to where we are.

But I think there is there is tons of innovation in music that should happen now. That couldn't happen when you needed to really adhere to the distribution constraints. If you didn't adhere to that, you would get no distribution. So so Bjerke, for example, Icelandic artist, she made a full iPad up as an album. That's very expensive. You know, even though the App Store has great distribution, she gets nowhere near the distribution versus staying within the three minute format.

So I think now that music is fully digital inside these streaming services, there is there is the opportunity to change the format again and allow creators to be much more creative without limiting their distribution ability. That's interesting that you're right. It's surprising that we don't see that taking advantage more often. It's almost like the constraints of the distribution from the 50s and 60s have molded the culture to where we want the five, three to five minutes on that. Anything else?

Not just so we want the song as consumers and as artists. Like because I write a lot of music and I never even thought about writing something longer than 10 minutes. It's really interesting that those constraints, because all your training data has been three and a half minutes is right. OK, so yes, digitization of data led to an MP three years.

Yes. I think you had this file then that was distributed physically, but then you had the components of digital distribution and then the Internet happened and there was this vacuum where you had a format that could be digitally shipped, but there was no business model. And then all these pirate networks happened. Napster and in Pirate in Sweden, Pirate Bay, which was one of the biggest. And it you know, I think from a consumer point of view, which kind of leads up to the inception of Spotify, from a consumer point of view, consumers for the first time had this access model to music where they could without kind of any marginal costs.

They could they could try different tracks. You could use music in new ways. There was no marginal cost. And that was a fantastic consumer experience. To have access to all the music ever made, I think was fantastic. But it was also horrible for artists because there was no business model around it. So they didn't make any money. So the user need almost drove the user interface because before there was a business model and then there were these download stores that allowed you to download files, which was a solution, but it didn't solve the access problem.

There was still a marginal cost of 99 cents to try one more track. And I think that that heavily limits how you listen to music.

The example I always give us, you know, in spot. A huge amount of people listen to music while they sleep when they go to sleep in real estate. If that costed you 99 cents for three minutes, you probably wouldn't do that and you would be much less adventurous if there was a real dollar cost exploring music. So the access model is interesting in that it changes your music behavior. You can be you can take much more risk because there's no marginal cost to it.

Maybe let me linger on piracy for a second, because I find especially coming from Russia. Piracy is something that's very interesting to me, not me, of course, ever. But I have friends who partook in piracy of music software, TV shows, sporting events. And usually to me, what that shows is not that they're they can actually pay the money and they're not trying to save money. They're choosing the best experience. So what to me, piracy shows is a business opportunity in all these domains.

And that's where I think you're right. Spotify stepped in, is basically piracy was is an experience you can explore with fine music you like. And actually, the interface of piracy is as horrible because it's I mean, it's not metadata. Yeah. But metadata, long download times, all kinds of stuff. And what Spotify does is basically first rewards artists and second makes the experience of exploring music much better. And the same is true, I think, for movies and so on.

Piracy reveals in the software space, for example, I'm a huge user and fan of Adobe products and the there is much more incentive to pirate Adobe products before they went to a monthly subscription plan. And now all of the sudden, friends that you used to pirate Adobe products that I know now actually pay gladly for the monthly subscription. I think you're right.

I think it's it's a sign of an opportunity for product development and that sometimes the there's a product market fit before there is a business model that fits in product development. I think that that's that's a sign of it in Sweden. I think it was a bit of both. There was there was a culture where we even had a political party called the Pirate Party. And this was during the time when when people said that, you know, information should be free.

It's somehow wrong to charge for ones and zeroes. So I think people felt that artists should probably make some money somehow else and, you know, concerts or something. So at least in Sweden, it was part really social acceptance, even at the political level. And that but that also forced Spotify to compete with with free, which which I don't think would actually could have happened anywhere else in the world. The music industry needed to be doing bad enough to take that risk.

And Sweden was like a perfect testing ground. It had government funded high bandwidth, low latency broadband, which meant that the product would work. And it was also there was no music anyway. So they were kind of like, I don't think this is going to work, but why not? So this product is one that I don't think could have happened in America, the world's largest music market, for example.

So how do you compete with free? Because that's an interesting world of the Internet where most people don't like to pay for things. So Spotify steps in and tries to compete with free. How do you do it?

So I think two things. One is people are starting to pay for things on the Internet. I think one way to think about it was that advertising was the first business model because no one would put a credit card on Internet. Transactional with Amazon was a second and maybe a subscription is that third. And if you look offline, subscription is the biggest of those. So that may still happen. I think people are starting to pay, but definitely back then we needed to compete with free.

And the first thing you need to do is obviously to lower the price to free and then you need to be better somehow. And the way that Spotify was better was on the user experience, on the on the actual performance, the latency of, you know, even if even if you had.

High bandwidth broadband, it would still take you 30 seconds to a minute to download one of these tracks. So the Spotify experience of starting within the perceptual limit of immediacy, about 250 milliseconds, meant that the whole trick was that felt as if you had downloaded all the power that it was on your hard drive. It was that fast, even though it wasn't and it was still free. But somehow you were actually still being a legal citizen. That was the trick that Spotify managed to to pull off.

So I've actually heard you say this or write this. And I was surprised. I wasn't aware of it because I just took it for granted. You know, whenever an awesome thing comes along, you just like, of course, has to be this way. That's exactly right. That it felt like the entire world's libraries at my fingertips because of that of the latency being reduced. What was the technical challenge in reducing the leak?

So there was a group of really, really talented engineers. One of them called Ludwigs Sergius. He wrote the actually from Guttenberg. He wrote the initial the Utahan client, which is kind of an interesting backstory to Spotify, that we have one of the top developers from from BitTorrent clients as well. So we wrote Utahan, the world's smallest BitTorrent client. And then he he was acquired very early by Daniel and Martin, who founded Spotify.

And they actually sold the youth of your client to BitTorrent, but kept Ludvik. So Spotify had a lot of experience within Peer-to-peer networking. So the original innovation was it was a distribution innovation where Spotify build an intense media distribution system. Up until only a few years ago, we actually hosted all the music ourselves. So we had both the server side in the client. And that meant that we could do things such as having a peer-to-peer solution to use local caching on the client side, because back then the world was mostly desktop.

But we could also do things like hacked TCP protocols, things like Nagle's algorithm for kind of exponential backoff or ramp up and just go full throttle and optimized for latency at the cost of bandwidth. And all of this end to end control meant that we could do an experience that felt like a step change. These days we actually are on on GCP. We don't host our own stuff and everyone is really fast these days. So that was the initial competitive advantage.

But then obviously you have to move on over time. And that was it was over 10 years ago, right?

That was in 2008. The product was launched in Sweden, was in a I think 2007 and it was on the desktop. So desktop on it. There's no phone. There was no phone. The iPhone came out in 2008, but the App Store came out one year later, I think. So the writing was on the wall, but there was no phone yet. You've mentioned that people would use Spotify to discover the songs they like and then they would torrent those songs, too, so they can copy it to their phone.

Just hilarious on that torrent pirate. Seriously, piracy does seem to be like a good guide for business models.

Video content.

As far as I know, Spotify doesn't have video content, but we do have music videos and we do have videos on the on the servers. But the way we think about ourselves is that we're we're an audio service. And we think that if you look at the amount of time that people spend on audio, it's actually very similar to the amount of time that people spend on video. So the opportunity should be equally big, but today is not at all value.

Video is value much higher. So we think it's basically completely undervalued. So we think of ourselves as an audio service. But within that audio service, I think video can make a lot of sense. I think for when you're when you're discovering an artist, you probably do want to see them and understand who they are to understand their identity. You won't see the video every time. Now, 90 percent of the time, the phone is going to be in your pocket for podcasters.

You use video. I think they can make a ton of sense. So we do have video, but we're an audio service where I think of it, as we call it internally background, both video video that is helpful, but isn't isn't the driver of the narrative. I think also if you look at YouTube, the way people it's quite a few folks who listen to music on YouTube. So in some sense, YouTube is a bit of a competitor to just Spotify, which is very strange to me that people used YouTube to listen to music.

They play essentially the music videos. Right. But don't watch the videos and put in their pocket. Well, I think I think it's similar to to what strangely, maybe it's similar to what we were for the piracy networks where YouTube for historical reasons have.

A lot of music videos, so you use people use YouTube for a lot of the discovery part of the process, I think then it's not a really good sort of quote unquote, MP three player, because it doesn't even background that you have to keep the app in the foreground. So so there is not a good consumption tool, but it's a decent, good discovery. I mean, I think you're with plastic products and I use it for all kinds of purposes.

So if I were to admit something, I do use YouTube a little bit for the discovery to assist in the discovery process of songs. And then if I like it, I'll I'll add it just fine. But that's OK. That's OK with that. OK, so so we're jumping around a little bit so that this kind of incredible you look at Napster, look at the early days of Spotify. How do you one fascinating point is how do you grow a user base?

So you learn in Sweden you have an idea. I saw the initial sketches that look terrible. How do you grow user base from from a few folks to millions?

I think there are a bunch of technical answers. So first of all, I think you need a great product. I don't think you take a bad product and and market it to be successful. So you need a great product. But sorry to interrupt, but it's a totally new way to listen to music, too. So it's not just did people realize immediately that Spotify is a great product? I think they did. So back to the point of piracy, it was a totally new way to listen to music illegally.

But people had been used to the access model in Sweden and the rest of the world for a long time through piracy. So one way to think about Spotify, it was just legal and fast piracy. And so people have been using it for a long time. So they weren't alien to it. They didn't really understand how it could be legal because it was seen too fast and too good to be true, which I think is a great product proposition if you can be too good to be true.

But what I saw again and again was people showing each other, clicking the songs, showing how fast it started. And I can't believe this, you know, so I really think it was about speed. Then we also had an inside product program that was there was really meant for scaling because we hosted our own servers. We need to control scaling. But that built a lot of expectation. And I don't want to say hype because I hype implies that it was that it wasn't true expectation and excitement around the product.

And we've replicated that. When we launched in the US, we also built up an invite only program for. So lots of tactics. But I think you need you need a great product to solve some problem. And basically the key innovation there was technology, but on a meta level, the innovation was really the access model versus the ownership model. And that was tricky. A lot of people said that they I mean, they wanted to own their music.

They would never kind of rent it or borrow it. But I think the fact that we had a free tier, which meant that you get to keep this music for life as well, helped quite a lot. So this is an interesting psychological point. May maybe you can speak to as a big shift for me, like like I had to. It's almost like a go to therapy for this is I think I would describe my early listening experience and I think a lot of my friends do is basically hoarding music is your like slowly one song by one song or maybe albums gathering a collection of music that you love and you own it.

It's like often especially with CDs or tape you like physically had it. And what Spotify what I had to come to grips with it was kind of liberating actually is to throw away all the music.

I've had this therapy session with lots of people and I think the mental trick is so actually we've seen the use of data and Spotify started. A lot of people did the exact same thing. They started hoarding as if the music would disappear. I almost the equivalent of downloading. And so, you know, we had these playlists that had limits of like a few hundred thousand tracks. We figured no one will ever like what they do and hundreds and hundreds of thousands of tracks.

And to this day, you know, some people want to actually save, quote unquote and the entire catalog. But I think that that therapy session goes something like instead of throwing away your music, if you took your files and you stored them in the locker at Google, it'd be a streaming service. It's just that in that locker you have all the world's music now for free. So instead of giving away your music, you got all the music.

It's yours. It's you could think of it as having a copy of the world's catalog there forever. So you actually got more music instead of less. It's just that you just took that hard disk and you sent it to to someone who stored it for you. And once you go through that mental journey, I'm like, still my files are just over there and I just have forty million other fifty million or something. Now then people are like, OK, that's the problem is I think because you paid us a subscription, if we hadn't had the free to air where you would feel like even if I don't want to pay anymore, I still get to keep them.

You keep your playlist forever, they don't disappear even though you stop paying. I think that was really important. If we would have started, as you know, you can put in all this time, but if you stop paying, you lose all your work. I think that would have been a big challenge. And what's the big challenge for a lot of our competitors? That's another reason why I think the free to air is really important, that people need to feel the security, that the work they put in it will never disappear, even if they decide not to pay legally.

But the work you put in actually stopped you. And think of it that way, just actually Spotify taught me to just enjoy music as opposed as opposed to what I was doing before, which is like in an unhealthy way, hoarding music. Which I found that because I was doing that, I was listening to a small selection of songs way too much toward where I was getting sick of them, whereas Spotify, the more liberating kind of approach is I was just enjoying.

Of course, I listen to Stairway to Heaven over and over, but because of the extra variety, I don't get as sick of them. There's an interesting statistic. I saw that. So Spotify has maybe you can correct me, but over 50 million songs, tracks and over three billion playlists. So, yes, a million songs and three billion playlists, 60 times more playlists. What do you make of that? Yeah. So the way I think about it is that from a from a statistician or machine learning point of view, you have all these if you want to think about reinforcement learning, but you have this data base of all the tracks and you can take different journeys through this through this world.

And these I think of these as like people helping themselves and each other, creating interesting vectors through the space of tracks. And then it's not so surprising that across, you know, many tens of millions of kind of atomic units, there will be billions of paths that make sense. And we're probably pretty, quite far away from having found all of them. So kind of our job now is users. When Spotify started, it was really a search box that was, for the time, pretty powerful.

And then I'd like to refer to it as this programming language called Play Listening, where if you as you probably were pretty good at music, you knew your new releases, you knew your back catalog, you knew your Stairway to Heaven, you could create a soundtrack for yourself using this play, listening to all this like metaprogramming, language for music to soundtrack your life and people who are good at music. It's back to how do you sell the product for people who are good at music.

That was actually enough. If you had the catalog in a good search tool, you can create your own sessions. You could create really good a soundtrack for your entire life, probably perfectly personalized because you did it yourself. But the problem was most people, many people aren't that good at music. They just can't spend the time. Even if you're very good at music, it can be hard to to keep up. So what we did to try to scale this was to essentially try to build you can think of them as agents that this this friend that some people had that helped them navigate this music catalog.

That's what we're trying to do for you. But also there is something like two hundred million active users on Spotify. So they're so OK. So for the machine learning perspective, you have these two hundred million people, plus they're creating. It's really interesting to think of playlists as I mean, I don't know if you meant it that way, but it's almost like a programming language. It's a release that trace of exploration of those individual agents, the listeners.

And you have all this new tracks coming in. So it's a fascinating space that is ripe for machine learning. So that is there is there is a path. How can playlists be used as data in terms of machine learning and just how Spotify organize the music? So we found in our data not surprising that people who play listed a lot, they retain much better. They had a great experience. And so our first attempt was to playlists for users.

And so we acquired this company called Nego of EDS and professional playlists and kind of leveraged the maximum of human intelligence to help to help build kind of these vectors through the track space for four people and that that broaden the product. Then the obvious next. And we you know, we use statistical means where they could see when they created a playlist. How did that playlist perform? You know, they could see snippets of the songs. They could see how the songs perform, and they manually iterated the playlist to maximize performance for a large group of people.

But there were never enough editors to playlists for you personally. So the promise of machine learning was to go from kind of group personalization, using editors and tools and statistics to individualisation. And then what's so interesting about the three billion playlist we have as we end the truth is we lucked up. This was not a primary strategy. As is often the case. It looks really smart in hindsight was as dumb luck. We looked at these playlists and we had some people in the company person named their grandson.

That was really good at machine learning already back in back then in like 2007, 2008. Back then it was mostly collaborative filtering and so forth. But we realized that what? What this is, is people are grouping tracks for themselves that have some semantic meaning to them, and then they actually label it with a playlist name as well. So in a sense, people were grouping tracks along semantic dimensions and labeling them. And so could you could you use that information to find that that latent and betting?

And so we started playing around with collaborative filtering and we saw tremendous success with it, basically trying to extract some of these some of these dimensions. And if you think about it's not surprising at all, it would be quite surprising if playlists were actually random, if they had no semantic meaning for for most people, they group these tracks for some reason. So we just happened across this incredible data set where people are taking taking these tens of millions of tracks and grouped them along different semantic vectors and the semantics being outside the individual users as some kind of universal there's a universal embedding that holds across people on this earth.

Yes, I do think that the embedding that you find are going to be reflective of the people who play listed. So if you have a lot of indie lovers who play, your own band is going to perform better their. But what we found was that, yes, there were these these latent similarities, they were very powerful and we had them. It was interesting because I think that the people who play listed the most initially were the so-called music aficionados who who were really into music.

And they often had a certain their taste was often geared towards a certain type of music. And so what surprised us, if you look at the problem from the outside, you might expect that the algorithms would start performing best with mainstreamers first because it somehow feels like an easier problem to solve mainstream taste than really particular taste was the complete opposite for us. The recommendations performed fantastically for people who saw themselves as having very unique taste. That's probably because all of them less and they didn't perform so well for mainstream is they actually thought they were a bit too particular and unorthodox.

So we had the complete opposite of what we expected. Success within the hardest problem first and then had to try to scale to more mainstream recommendations.

So you've also acquired economists that analyze the song data. So in your view, maybe you can talk about what kind of data is there from a machine learning perspective? There's like a huge amount. We're talking about playlists and just user data of what people are listening to, the playlist they're constructing and so on. And then there is the the actual data within a song. What makes a song? I don't know. The the actual waveforms is there. How do you mix the two?

How much value is there in each? To me it seems like user data is. Well, it's a romantic notion that the song itself will contain useful information, but if I were to guess user data would be much more powerful, like playlists would be a much more powerful. Yeah, so we use both our biggest success initially what was with playlist data without understanding anything about the structure of the song. But when we acquired the Equinox, they had the inverse problem.

They actually didn't have any play data. They were just they were a provider of recommendations, but they didn't actually have any play data. So they they looked at the structure of songs sonically and they looked at Wikipedia for cultural references and so forth.

Right. And did a lot of analysis and so forth. So we got that skill into the company and combine kind of our user data with their with their kind of content based. So you can think of as we were user base and they were content based on their recommendations. And we combine those two. And for some cases where you have a new song that has no no play data, obviously you have to try to go by either you know who the artist is or or the sonic information in the song or what it's similar to.

So so there's definitely value in both. And we do a lot in both. But I would say, yes, the user data captures things that that have to do with culture in the greater society that you would never see in the in the content itself. But that said, we have seen we have a research lab in Paris when we can talk about more about that kind of machine on the creative side, what it can do for creators, not just for the consumers, but where we looked at how does the structure of a song actually affect the listening behavior?

And it turns out that there is a lot of we can we can predict things like skips based on, you know, based on on the song itself. We could say that maybe some of that core is a bit because the skip is going to go up here. There is a lot of latent structure in the music, which is not surprising because it is some sort of mind hack. So there should be structure. That's probably what we respond to.

You just blew my mind, actually, from the creative perspective. So that's a really interesting topic that probably most creators aren't taking advantage of. Right. So there's I've recently got to interact with a few folks, you tubers, who are like obsessed with this idea of what do I do to make sure people keep watching the video and they like look at the analytics of which point people turn it off and so on. First of all, I don't think that's healthy, but it's because you can do it a little too much.

But it is a really powerful tool for helping the creative process. You just made me realize you could do the same thing for creation of music. And so that's something you've looked into of it is.

Can you speak to how much opportunity there is for that? Yeah, I think I listen to to the podcast with Xeros and I thought it was fantastic interactive to do the same thing where he said and he said he posted something in the morning. Yeah. Immediately. What's the feedback where the drop off was and then responded to that in the afternoon. Yeah. Which which is quite different from how people make podcast for example. Yes exactly. I mean the feedback loop is almost non-existent.

So if we back out to one level, I think actually both for music and podcasts, which we also do at Spotify, I think there is a tremendous opportunity just for the creation workflow. And I think it's really interesting speaking to you, who because you're a musician, a developer and a podcast, if you think about those three different roles, if you if you make the leap as a musician, if you if you think about it as a software tool, change really your door with the stems.

That's the idea. Right. That's where you work in source code formats with your with what you're creating. Then you sit around and you play with that. And when you're happy, you compile that thing into some sort of ACOR empathy or something. You do that because you get distribution. There are so many run times for that MS3 across the world, Lancasters and stuff. So you kind of compile this executable, you ship it out in kind of an old fashioned box software analogy and then you hope for the best.

Right. Right. But as a as a as a software developer, you would never do that. First you go and get help and you collaborate with other creators. Yeah. And then you think it'd be crazy to just ship one version of the software without doing an AP test without any feedback loop and then issue tracking. Exactly. And then you would you would look at the feedback loops and try to optimize that thing. Right. So I think if you think of it as a very specific software toolchain, it looks quite arcane.

You know, the tools that a music creator has versus what a software developer has. So that's kind of how we think about it. And why wouldn't a why wouldn't a music creator have something like GitHub where you could collaborate much more easily? So we have we bought this company called Satrap, which has a kind of. Google Docs for music approach, where you can collaborate with other people on the kind of source code format with stamps and I think introducing things like A.I. tools there to help you as you're creating music both in and helping you, you know, put a to your music like drums or something and help you master and mix automatically help you understand how this track will perform.

Exactly what you would expect as a software developer, I think makes a lot of sense. And I think the same goes for for a podcast or I think podcasts will expect to have the same kind of feedback loop that Xerox has.

Like, why wouldn't you maybe maybe it's not healthy, but sorry, I wanted to criticize the fact because you can overdo it because a lot of the E and we're in a new era of that, so you can become addicted to it. And therefore, what people say, you become a slave to the YouTube algorithm. I sort of it's always a danger of a new technology as opposed to say if you're creating a song becoming too obsessed about the intro riff to the song that keeps people listening versus actually the entirety of the creation process is balanced.

The fact that there's zero, I mean, you're blowing my mind right now because you're completely right that there is no signal whatsoever. There's no feedback whatsoever. And the creation process in music or podcasting almost at all. And are you saying that Spotify is hoping to help create tools to not tools, but the tools, actually actually tools for creators? Absolutely. So we have we've made some acquisitions the last few years around music creation. This company called Soundtrack's, which is a digital audio workstation, but that is browser based.

And their focus was really the Google Docs approach where you can collaborate with people much more easily than you could in previous tools. So we have some of these tools that we're working with that we want to make accessible and then we can connected with our with our consumption data. We can create this feedback loop where we could help you understand how we could help you create and help you understand how you will perform. We also acquired this other company within podcasting called Anchor, which is one of the biggest podcasting tools, mobile focused, so really focused on simple creation or easy access to creation.

But that also gives us this feedback loop. And even before that, we we invested in something called Spotify for artists and Spotify for podcasters, which is an app that you can download or you can verify that you are that creator and then you get you get things that and software developers have had for years. You can see where if you look at your podcast, for example, on Spotify or or some of the you released, you can see how it's performing, which cities is performing and who's listening to it, what's the demographic break up.

So it's so similar in the sense that you can understand how you're actually doing on the on the platform. So we definitely want to build tools. I think you also interviewed the head of research for Adobe, and I think that's an that's an to Photoshop that you like. I think that's an interesting analogy as well. Photoshop, I think, has been very innovative and helping photographers and artists. And I think there should be the same kind of tools for for music creators.

What you could get assistance, for example, that's you creating music, as you can do with Adobe where you can. I want to sky over here and you can get help creating that sky. The really fascinating thing is what Adobe doesn't have is a distribution for the content you create. So you don't have the data of if I create fire, you know, whatever creation I make in Photoshop or Premier, I can't get, like, immediate feedback like I can on YouTube, for example, about the way people are responding.

And if Spotify is creating those tools, that that's a really exciting actually world. But let's talk a little about podcasts. It's. So I have trouble talking to one person, so it's a bit terrifying and kind of hard to fathom, but an average 60 to one hundred thousand people will listen to this episode. OK, so it's intimidating. It's intimidating. So I hosted on Blueberry. I don't know if I'm pronouncing that correctly. Actually, it looks like most people listen to an Apple podcast, cash box and pocket gas and only about a thousand listen on Spotify, just my podcast.

All right. So where do you see a time when Spotify will dominate this? Spotify is relatively new into the podcasting, dancing. So, yeah. And podcasting. What's the deal with podcasting and Spotify? How serious is Spotify about podcasting? Do you see a time where everybody would listen to, you know, probably a huge amount of people, majority, perhaps listen to music on Spotify? Do you see a time when the same is true for podcasting?

Well, I certainly hope so. That is our mission. Our mission as a company is actually to enable a million creators to live off of their art and have been inspired by. And what I think is interesting about that mission is it actually puts the creators first, even though it's not as a consumer focused company and it's just to be able to live off of there are not just make some money off of there as well. So it's it's quite an ambitious project.

And so we think about creators of all kinds. And we kind of expanded our mission from being music to being audio a while back. And that's not so much because we think we made that decision. We think that decision was was made for us. We think the world made that decision. Whether we like it or not, when you put in your headphones, you're going to make a choice between music and a new episode of of of of your podcast or something else.

Right. We're in that world, whether we like it or not. And that's how radio work. So we decided that we think it's about audio. You can see the rise of audio books and so forth. We think audio is this great opportunity. So we decided to enter it. And obviously Apple and Apple podcast is absolutely dominating in podcasting. And we didn't have a single podcast only like two years ago. What we did, though, was we we looked at this and said, no, can we bring something to this?

You know, we want to do this. But back to the original Spotify, we have to do something that consumers actually value to be able to do this. And the reason we've gone from not existing at all to being that the quite a quite a wide margin, the second largest podcast consumption, still still wide gap to iTunes. But we're growing quite fast.

I think it's because when we when we looked at the consumer problem, people said, surprisingly, that they wanted their podcasts and music in the same in the same application. So what we did was we took a little bit of a different approach. What we said, instead of building a separate podcast app, we thought it's the consumer problem to solve here because the others are very successful already. And we thought there was in making a more seamless experience where you can have your podcast and your music in the same application because we think it's audio to you and that that has been successful.

And that meant that we actually had 200 million people to offer this to instead of starting from zero. So I think we have a good chance because we're taking a different approach than the competition. And back to the other thing I mentioned about creators, because we're looking at the end to end flow. I think there is a tremendous amount of innovation to do around podcast as a format. When we have creation, tools and consumption, I think we could start improving what podcasting is.

I mean, podcast is this this opaque, big, like one two hour file that you're streaming, which it really doesn't make that much sense in twenty nineteen that it's not interactive, there's no feedback loops, nothing like that. So I think if we're going to win it's going to have to be because we build a better product for creators and for for consumers. So we'll see. But it's certainly our goal. We are a long way to go or the creators part is really exciting.

Early you got me hooked. There is the only state I have a blueberry. Just recently added the stats of whether it's listen to the end or not. And that's like a huge improvement. But that's still nowhere to where you could possibly go in terms of just you just download the podcast or up and verify and then then you'll know where people dropped out in this episode.

Oh, OK. The moment I started talking, OK, I might be depressed by this, but OK. So one one other question. The original Spotify for music. And I have a question about podcasting in this line is the idea of albums of what music aficionados, friends who are really big fans of music often really enjoy albums, listening to entire albums of artists. Correct me if I'm wrong, but I feel like Spotify has helped replace the idea of an album with playlists.

So you create your own albums. It's kind of the way at least I have experienced music and I have really enjoyed that way. One of the things that was missing in podcasting for me, I don't know if it's missing. I don't know. It's an open question for me, but the way I listen to podcast is the way I would listen to albums. So I take Joe Rogan experience and that's an album. And I listen, you know, like I put that on and I listen to one episode after the next and there's a sequence and so on.

Is there room for doing what you did for music or doing what Spotify did for music, but creating playlists, sort of this kind of playlists, the idea of breaking apart from podcasting, from individual podcasts and creating kind of this interplay? Or have you thought about that space? It's a great question. And I think in in music, you're right. Basically, you bought an album, so it was like you bought a small catalog of like 10 tracks, right?

It was again, it was actually a lot of a lot of consumption. You think it's about what you like, but it's based on the business model where you paid for this 10 track service. And then you listen to that for a while. And then when when everything was flat priced, you tended to listen differently now. So so I think the I think the album is still tremendously important. That's why we have it. And you can save albums and so forth.

And you have a huge amount of people who really listen according to albums. And I like that because it is a creative format. You can tell a longer story over several tracks. And so some people listen to just one track. Some people actually want to hear that whole story. Now in podcast, I think. I think it's different, you can argue that podcast's might be more like shows on Netflix have like a full season of Narcos and you're probably not going to do like one episode of Narcos and then one of House of Cards.

You know, there is a narrative there. And you you love the cast and you love this show. So I think people will people love shows and I think they will they will listen to those shows. I do think you follow a bunch of shows at the same time. So there's certainly an opportunity to bring you the latest episode of, you know, whatever the five, six, 10 things that that you're into. But but I think I think people are going to listen to specific hosts and love those hosts for a long time, because I think there is something different with podcast where this format of the experience of the of the audience is actually sitting here right between us.

Whereas if you look at something on TV, the audio actually would come from you would sit over there and the audio would come to you from both of us, as if you were watching that as you were part of the conversation. So my experience having to listen to podcasts like yours and Joe Rogan is I feel like I know all of these people. They have no idea who I am, but I feel like I listen to so many hours and it's very different from me watching a watching like a TV show or an interview.

So I think you you kind of fall in love with people and experience in a different way. So I think I think shows and hosts are going to be very, very important. I don't think that's going to go away into some sort of thing where, well, you don't even know who you're listening to. I don't think that's going to happen. What I do think is I think there's a tremendous discovery opportunity in podcasts because the catalog is growing quite quickly.

And I think podcast is only a few like five, six hundred thousand shows right now. If you look back to YouTube as another analogy for creators, no one really knows if you would lift the lid on YouTube, but it's probably billions of of episodes. And so I think the podcast catalog would probably grow tremendously because the creation tools are getting easier. And then you're going to have this discovery opportunity that I think is really big. So it's a lot of people tell me that they love their shows, but discovering podcasts kind of suck.

It's really hard to get into a new show that you usually quite long. It's a big time investment. I think there's plenty of opportunity in the discovery part. Yeah, for sure. 100 percent in and even the dumbest. There's so many low hanging fruit to, for example, just knowing what episode to listen to. First to try out a podcast. Exactly. Because most podcasts don't have an order to them. They can be listened to out of order and sorry to say.

Some are better than others episodes, so some episodes of your own are better than others, and it's nice to know which you should listen to to try it out. And there's as far as I know, almost no information in terms of like upvotes on how good an episode is exactly.

So I think part of the problem is it's kind of like music. There isn't one answer. People use music for different things. And there's actually many different types of music. There's work of music and there's classical piano music and focus music and and so forth. I think the same with podcasts. Some podcasts are sequential. They're supposed to be listened to in order. It's actually it's actually telling a narrative. Some podcasts are one topic, kind of like yours, but different guests.

So you could jump in anywhere. Some podcasts, actually completely different topics. And for those podcasts, it might be that I want you know, we should recommend one episode because it's about I hear from someone, but then they talk about something that you're not interested in the rest of the episode. So I think, well, we're spending a lot of time on now is just first understanding the domain and creating kind of the knowledge graph of how do these objects relate and how do people consume.

And I think we'll find that it's going to be it's going to be different. I'm excited because you're the Spotify is the first people I'm aware of that are trying to do this for podcasting. Podcasting has been like a Wild West up until now.

It's been a very we want to be very careful, though, because it's been a very good Wild West. I think it's this fragile ecosystem. And we want to make sure that you don't barge in and say, like, oh, we're going to internalise this thing and you have to think about the creators. You have to understand how they get distribution today, who listen to how they make money today, try to, you know, make sure that their business model works, that they understand.

I think it's back to doing something to improving their product like feedback loops and distribution.

So jumping back into terms of the fascinating world of recommender system and listening to music and using machine learning to analyze things, do you think it's better to what currently? Correct me if I'm wrong, but currently Spotify lets people pick what they listen to. The most part, there's a discovery process, but you kind of organise playlists. Is it better to let people pick what they listen to or recommend what they should listen to? Something like stations by Spotify.

I saw that you're playing around with. Maybe you can tell me what's the status of that? This is Pandora style app that just kind of as opposed to you select the music you listen to, it kind of feeds you the music you listen to. What's the status of stations by Spotify? What's its future? The store, Spotify, as we have grown, has been that we made it more accessible to different different audiences and stations. Is another one of those where the question is some people want to be very specific to actually want to hear Stairway to Heaven right now.

That needs to be very easy to do. And some people, or even the same person at some point might say, I want to feel upbeat or I want to feel happy or I want songs to sing in the car. So they put in they put in the information on a very different level. And then we need to translate that into that, what that means musically. So stations as a test to to create like a consumption input vector that is much simpler, where you can just tune in a little bit and see if that increases the overall reach.

But we're trying to kind of serve the entire gamut of super advanced so-called music aficionados all the way to to people who they love listening to music. But it's not their number one priority in life. Right? They're not going to sit and follow every new release from every new artist. They need to be able to to influence music at a at a at a different level. So we're trying you can think of it as different products. And I think when one of the one of the interesting things to answer your question on, if it's better to let the user choose or to play, I think the answer is the the challenge.

When you when machine learning kind of came along, there was a lot of thinking about what this product development mean in in a machine learning context. People like Andrew NG, for example, when he went to Baidu, he started doing a lot of practical machine learning, went from academia, and he thought a lot about this. And he had this notion that, you know, a product manager, a designer, an engineer, used to work around his wireframe, kind of describe what the product should look like or some talk about when you're doing like a chatbot or a playlist.

How do you what are you going to say? Like, it should be good. That's not a good product description. So how do you how do you do that? And he came up with this notion that the tests that it's the new wireframe, the job of the product manager, is to source a good test set that is representative of what like if you say like I want to. That is songs to sing in the car job, the probe managers go in stores like a good test set of what that means, then you can work with engineering to have algorithms to try to produce that right.

So we try to think a lot about how to structure product development for for a machine learning age. And what we discovered was that a lot of it is actually in the expectation. And you can go you can go to waste, so. Let's say that if you if you set the expectation with the user that this is a discovery product like Discovery Weekly, you're actually setting the expectation that most of what we show you will not be relevant when you're in the discovery process.

You're going to accept that. Actually, if you find one gem every Monday that you totally love, you're probably going to be happy, even though the statistical meaning one out of 10 is terrible or one out of 20 is terrible from a user point of view because the setting was Discovery's fine. Sorry to interrupt real quick. I just actually learned about Discover Weekly, which is a Spotify. I don't know, it's a feature Spotify that shows you cool songs to listen to.

I maybe I can do issue tracking. I couldn't find out my Spotify app. It's in your library. It's in the library. It's in the list. Because I was like, whoa, this is cool. I didn't know this existed. And I try to find it, but I doesn't show it to you.

Back to our product. Yeah. There you go. But yeah, it's so yes. I just just to mention the expectation there is basically they you're going to discover new songs. Yeah. So so then you can be quite adventurous in, in the recommendations you do. But, but if you're. But we have another product called Daily Mix which kind of implies that these are only going to be your favorites if you have one out of 10. That is good.

And nine out of 10 that doesn't work for you. You're going to think it's a horrible product. Actually, a lot of the product development we learned over the years is about setting the right expectations. So for the Olympics, you know, algorithmically we would pick among things that feel very safe in your taste space was this couple of weekly. We go kind of wild because the expectation is most of this is not going to. So so a lot of that.

A lot of times your question. There are a lot of should you let the user pick or not? It depends. We have some products where the whole point is that the user can click, play, put the phone in the pocket and it should be really good music for like an hour. We have other products where you probably need to say, like, no, no, say no, no. And it's very interactive. I say that makes sense.

And then the radio product, the station's product is one of these like click play put in your pocket for hours.

That's really interesting. So you're thinking of different test sets of four different users and trying to create products that sort of optimize optimized for those tests that represent a specific set of users? Yes.

I think one thing that I think is interesting is we invested quite heavily in editorial, in people creating playlists, using statistical data, and they were successful for us. And then we also invested in machine learning and for the longest time within Spotify and within the rest of the industry, there was always this narrative of humans versus the machine, how to go versus editorial. And editors would say, like, well, if I had that data, if I could see your play in history and I made a choice for you, I would have made a better choice.

And they would have because they understood they're much smarter than these algorithms. A human is incredibly smart compared to algorithms. They can take culture into account and so forth. The problem is that they can't make 200 million decisions, you know, per hour for every user logs in. So the algo maybe not as sophisticated, but much more efficient. So there was this there was this contradiction. But then a few years ago, we started focusing on this kind of human in the loop, thinking around machine learning.

And we we actually coined an internal term for it called Algo Turrill, the combination of algorithms and EDS, where if we take a concrete example, you think of the editor, there's this paid expert that we have. There is really good at something like soul, hip hop, EDM, something. Right. There are two experts now and one in the industry. So they have all the cultural knowledge. You think of them as the product manager and you say that let's say that you want to create a you think that there's a there's a product need in the world for something like songs to sing in the car or songs to sing in the shower.

I'm thinking that example because it exists. People love to scream songs in the car when they drive, right? Yeah. So you want to create that product and you have this product manager who's a musical expert. They create they come up with a concept like I think this is a missing thing in humanity, like playing a song, sitting in the car. They they create the framing, the image, the title, and they create a test that they create a group of songs like a few thousand songs out of the catalogue that they manually curate that are known songs that are great to sing in the car.

And they can take like True Romance into account. They understand things that are algorithms do not at all. So they have this huge set of tracks. Then when we deliver that to you, we look at your taste factors and you get the 20 tracks that are songs to sing in the car in your taste. So you have you have personalization and editorial input in the same process, if that makes sense and makes sense.

Several questions around that. This is a this is fascinating. OK, so first, it is a little bit surprising to me that the world expert humans are outperforming machines at specifying songs to sing in the car. So maybe you could talk to that a little bit. I don't know if you can put it into words, but what is this? How difficult is this problem of do you really I guess what I'm trying to ask is there how difficult is it to encode the cultural references?

The context of the song, the artists, all all those things together, can machine learning really not do that? I mean, I think machine learning is great at replicating patterns if you have the patterns. But if you try to write me a spec of what songs create the song to sing in the car definition is, is it is it loud? Does have many causes. Should it have been in movies that it quickly gets incredibly complicated, right.

Yeah. And and a lot of it may not be in the structure of the song or the title. It could be cultural references because, you know, it was a HESTA. So so the definition problems quickly get. And I think that was the that was inside of Andrew NG when he said that the product managers understand these things that are that algorithms don't and then define what that looks like. And then you have something to train towards. Right.

Then you have kind of the test that and then so so today the editors create this pool of tracks and then we personalize. You could easily imagine that once you have this set, you could have some automatic expiration of the rest of the catalogue because then you understand what it is and then the other side of it want machine learning does help. Is this taste vector, how hard is it to construct a vector that represents the things an individual human likes, the human preference?

So you can you know, music isn't like it's not like Amazon, like things you usually buy. Music seems more and more like it's this thing that's hard to specify, like what is or, you know, if you look at my playlists, what is the music that I love? It's harder. It seems to be much more difficult to specify concretely. So how hard is it to build the taste factor? It is very hard in the sense that you need a lot of data.

And I think what we found was that. So it's not so it's not a stationary problem. It changes over time. And so we've gone through the journey of if if you've done a lot of computer vision, obviously I've done a bunch of computer vision in my past. And and we started kind of with the handcrafted sticks for, you know, this is kind of in the music. This is this. And if you consume this, you probably like this.

So we have we started there and we have some of that still. Then what was interesting about the playlist data was that you could find these latent things that wouldn't necessarily even make sense to you, that could could even capture maybe cultural references because they occurred things that they wouldn't have appeared kind of mechanistically in the content or so forth. So. I think that, um. I think the core assumption is that there are patterns in almost everything, and if there are patterns, these these embedding techniques are getting better and better now.

Now, as everyone else, we're also using kind of deep embedding so you can encode binary values and so forth. And what I think is interesting is, is this process to try to find things that that do not necessarily you wouldn't actually have have guessed. So it is very hard in a in an engineering sense to find the right dimensions. It's an incredible scalability problem to do for hundreds of millions of users and to update it every day. But but in theory, in theory, embedding isn't that complicated.

The fact that you try to find some principle components or something like that, dimensionality reduction. So the theory, I guess, is, is that the practice is very, very hard and it's a huge engineering challenge. But fortunately, we have some amazing research and engineering teams in this space. Yeah, I guess the the question is of I mean, similar deal with the autonomous vehicle spaces. The question is how hard is driving? And here is basically the question is of edge cases.

So embedding probably works. Not probably, but I would imagine works well in a lot of cases, so there's a bunch of questions that arise then so do song preferences. Does your taste factor depend on context, like mood? Right. So there's different moods and. Absolutely. So how does that work? Is it is it possible to take that into consideration or do you just leave that as an interface problem that allows you to just control it? So when I'm looking for a workout music, I kind of specify it by choosing certain playlists, doing certain search.

Yeah. So that's a great point. And back to the product development. You could try to spend a few years trying to predict which mood you're in, automatically open Spotify or you create a tab which is happy and sad and you're going to be right 100 percent of the time with one click. Now, it's probably much better to let the user tell you if they're happy or sad, if they want to work out. On the other hand, if your user interface become 20 tabs, you're introducing so much friction so no one would use the product.

So then you have to get better. So it's this thing where I think it maybe was I remember who coined it, but it's called full tolerant distractibility UI that is tolerant to being wrong. And then you can be much less right in your in your, in your algorithms. So we you know, we've had to learn a lot of that building, the right UI that fits where the where the machine learning is. And a great discovery there, which is, which was by the teams during one of our hack days, was this thing of taking discovery, packaging it into a playlist and saying that these are new tracks that we think you might like based on this and setting the right expectation, made it, made it a great product.

So I think we have this benefit that, for example, Tesla doesn't have that we can we can we can change the expectation. We can we can build a full tolerance setting. It's very hard to be faltering when you're driving at a hundred miles per hour or something. And we have the luxury of being able to say that, of being wrong if we have the right UI, which gives us different abilities to take more risk. So I actually think the self-driving problem is is much harder.

Yeah, for sure. It's much less fun because people die. Exactly. And since Spotify, it's such a more fun problem because failure will that mean failure is beautiful in a way, at least exploration. So it's it's a really fun reinforcement learning problem that the worst case scenario is to get these WTF tweets like how the hell did I get this? This song, which is which is a lot better than the self phase.

So what's the feedback that a user what's the signal that a user provides into the system? So the the you mentioned skipping what is like the strongest signal is you didn't mention clicking like so. So we have a few signals that are important, obviously playing playing through. So one of the benefits of music actually even compared to podcast or or movies is the object itself is really only about three minutes. So you get a lot of chances to recommend and the feedback loop is every three minutes instead of every two hours or something.

So you actually get kind of noisy but but quick, fast feedback. And so you can see if people played through or if that which is now the inverse of Skip, really, that's an important signal. On the other hand, much of the consumption happens when your phone is in your pocket. Maybe you're running or driving or you're playing on a speaker. And so you're not skipping doesn't mean that you love that song. It might be that it wasn't bad enough that you would wake up and skip.

So it's a noisy signal then. Then we have the equivalent of the like, which is just say that your library has a pretty strong signal of affection. And then we have the more explicit signal of playlist that you took the time to create a playlist. You put it in there. There's a very little small chance that if you took all that trouble, this is not a really important fact to you. And then we understand also what other tracks it relates to.

So we have we have to play listening. We have the like and then we have the listening or skip. And you have to have very different approaches to all of them because they have different levels of of noise when one is very voluminous but noisy and the other is rare. But you can you can probably trust it. Yeah, it's interesting because I think between those signals captures all the information you'd want to capture. I mean, there's a feeling, a shower feeling for me that just sometimes I hear songs like, yes, this is you know, this is the right song for the moment, but there's really no way to express that fact except by listening through it all the way.

Yeah. And maybe playing it again at that time or something. Yeah. There's no need for a button that says this was the best song I could have heard at this moment. Well, we're playing around with that. With the thumbs up concept saying, like, I really like this, just kind of talking to the algorithm, it's unclear if that's the best way for humans to interact. Maybe it is. Maybe they should think of Spotify as a person, an agent sitting there trying to serve you.

And you can say like that Spotify, good Spotify. Right now, the analogy we've had is more you shouldn't think of us. We should be invisible. And the feedback is, if you say that kind of you work for yourself, you do a playlist because you think is great and we can learn from that. It's kind of back to back to Tesla, how they kind of have this shadowman, what they did and what you drive. We kind of took the same analogy we said and what you playlist and then maybe we can we can offer you an autopilot where you can take over for a while or something like that and then back off.

If you say, like, that's not that's not good enough. But I think it's interesting to figure out what your mental model is. If Spotify is an A.I. that you talk to, which I think might be a bit too abstract for for many consumers, or if you still think of it as it's my music app, but it's just more helpful and depends on the device it's running on. Which brings us to smart speakers. So I have a lot of the Spotify listening I do is on things and devices I can talk to, whether it's from Amazon, Google or Apple.

What's the role of Spotify in those devices?

How do you think of it differently than on the phone or on the desktop?

There are few things to say about the. First of all, it's incredibly exciting. They're growing like crazy, especially in the in the in the US and it's solving a consumer need. That I think is is you can think of it as. Just remote interactivity, you can control this thing from from from across the room and it may feel like a small thing, but it turns out that friction matters to consumers. Being able to say play, pass and so forth from across the room is very powerful.

So basically, you made you made the living room interactive now. And what we see in our data is that the number one use case for these speakers is music, music and podcast. So fortunately for us, it's been important to these companies to have those use case covered. So they want to Spotify on this. We have very good relationships with them and we're seeing we're seeing tremendous success for them. What I think it's interesting about them is it's already working with we kind of had this epiphany many years ago back when we started using Stonehouse.

If you went through all the trouble of setting up your sonar system, you had this magical experience where you had all the music ever made in your living room. And we we we made this assumption that the home everyone used to have a CD player at home, but they never managed to get their files working in the home, having their network attached. Storage was too cumbersome for most consumers. So we made the assumption that the home would skip from the CD all the way to streaming box where you would get by the stereo without all the music built in.

That took longer than we thought, but with the voice speakers, that was the unlocking that made kind of the connected speaker happen in the home. So it really it really exploded and we saw this engagement that we predicted would happen. What I think is interesting, though, is where it's going from now. Right now, you think of them as voice speakers. But I think if you look at Google, I o for example, they just added a camera to it where, you know, when the alarm goes off instead of saying, hey, will stop, you can just wave your hand.

So I think they're going to think more of it as a as an agent or as a as an assistant, truly an assistant and an assistant that can see you. It's going to be much more effective than than a blind assistant. So I think these things will morph and we won't necessarily think of them as, quote unquote voice speakers anymore, just as. Interactive access to the Internet in the home, but I still think that the biggest use case for those will be will be audio.

So for that reason, we're investing heavily in it and we've built our own and stock to be able to. The challenge here is how do you innovate in that? Well, it's it lowers friction for consumers, but it's also much more constrained. You have no pixels to play with in an audio only world. It's really the vocabulary that is the interface. So we started investing and playing around quite a lot with that, trying to understand what the future will be of you speaking and gesturing and waving at your music.

And actually you're actually nudging closer to the autonomous vehicle space, because from everything I've seen, the level of frustration people experienced upon failure of natural language understanding is much higher than failure in other countries. People get frustrated really fast. So if you screw screw that experience, even just a little bit, they give up really quickly. Yeah. And I think you see that in the data while while it's tremendously successful, the most common interactions are play posts and, you know, next to things where if you compare it to taking up your phone, unlocking at bringing up the app and skipping clicking skip, it was it was much lower friction.

But then for for a longer, more complicated things like can you find me that some people still bring up the phone and search and then play it on their speaker. So we tried again to build a tolerant UI where for the more for the more complicated things, you can still pick up your phone, have powerful full keyboard search, and then try to optimize for where there is actually lower friction and try to it's kind of like the test autopilot thing.

You have to be at the level where you're helpful if you're too smart and just in the way people are going to get frustrated. And first of all, I'm not obsessed with Stairway to Heaven, but let me imagine that as a use case, because it's an interesting one. I've literally told one I don't want to say the name of the speaker because when people are listening to make the speaker go off, but I talk to the speaker and I say play Stairway to Heaven.

And every time it's like not every time a large percentage of the time plays the wrong Stairway to Heaven. It plays like some cover of the. And that part of the experience. I actually wonder from a business perspective, the Spotify control that entire experience or know, it seems like the Apple, you the the natural language stuff is controlled by the speaker and then Spotify stays at a layer below. That is a good and complicated question, some of which is dependent on the on the partner.

So it's hard to comment on the on the specifics, but the question is the right one. The challenge is if you can't use any other personalization, I mean, we know which Stairway to Heaven and the truth is maybe four for one person, it is exactly the cover that they want. And they'd be very frustrated if a place I think we I think we default to the right person. But but you actually want to be able to do the cover for the person that just played a couple of fifty times or Spotify is just going to seem stupid.

So you want to be able to leverage the personalization, but you have the stack where where you have the the ASALA in this thing called the N best list of the best guesses here. And then the positioning comes in at the end. You actually want the presentation to be here when you're guessing about what they actually meant. So we're working with these partners and it's a complicated it's a complicated thing where you want to you want to be able. So first of all, you want to be very careful with your users data.

You don't want to show your users data without the permission, but you want to share some data so that their experience gets better so that these partners can understand enough, but not too much and so forth. So it's really the trick is that it's like a business relationship where you're doing product development across companies together. Yeah, which is which is really complicated. But this is exactly why we built our own and a view so that we actually can make personalized guesses, because this is the biggest frustration from a user point of view.

They don't understand about azar's and invest lists and and business deals. They're like, how hard can it be? I've told this thing fifty times. This version is still the place, the wrong thing. It can't it can't be hard. Yeah. So we try to take the user approach. If the user, the user is not can understand the complications of business, we have to solve it. Let's talk about sort of a complicated subject that I myself am quite torn about the idea sort of of paying artists.

Right. I saw as of August 31st, twenty eighteen over 11 billion dollars are paid to rights holders. So and for the distributor artists from Spotify. So a lot of money is being paid to artists, first of all. The whole time as a consumer, for me, when I look at Spotify, I'm not sure I'm remembering correctly, but I think you said exactly how I feel, which is this is too good to be true. Like when I started using Spotify.

I assume you guys will go bankrupt in like a month. It's like this is too good.

A lot of people that as like this is amazing. So one question I have is sort of the bigger question, how do you make money in this complicated world? How do you deal with a relationship with record labels who are complicated? These big you're essentially have the task of herding cats, but like rich and powerful cats, and also have the task of paying artists enough and paying those labels enough and still making money in the Internet space, or people are not willing to pay hundreds of dollars a month.

So how do you navigate this space?

Because that's a beautiful description hurting rich cats. Yeah, that's for now. It is very complicated. And I think certainly actually betting against Spotify has been statistically a very smart thing to do. Just looking at the at the line of roadkill and music streaming services. It's it's kind of I think if I understood the complexity when I joined Spotify, unfortunately, unfortunately, I didn't know enough about the the music industry to understand the complexities because then I would have made a more rational guess that it wouldn't work.

So, you know, ignorance is bliss. But I think there have been a few distinct challenges. I think, as I said, one of the things that made it work at all was that Sweden and the Nordics was a lost market. So there were you know, there was there was no risk for labels to try this. I don't think it would have worked if if the market was was healthy. So so that was the initial condition then.

Then we had this tremendous challenge with the model itself. So now most people were pirating. But for the people who bought a download or CD, the artist would get all the revenue for all the future place then. Right. So you got it all up front. Whereas the streaming model was like almost nothing. They won almost nothing. They too. And then at some point, this curve of incremental revenue would intersect with your day one payment. And that took a long time to play out before before the music labels.

They understood that. But on the autosite, it took a lot of time to understand that actually if I have a big hit that is going to be played for four for many years. This is a much better model because I get paid based on how much people use the product, not how much they thought they would use it, day one and so forth. So it was a complicated model to get across and but time help with that.

Right. And now now the revenues to the music industry actually are bigger again. Then it's gone through this incredible dip and now they're back up. And so we're we're very proud of having having been a part of that. Um, so there have been distinct problems, I think when it comes to the to the labels, we have taken the painful approach, some of our competition at the time, they kind of they kind of looked at other companies and said, if we just if we just ignore the rights, we get really big, really fast, we're going to be too big for the for the labels to kind of too big to fail.

They're not going to kill us. We didn't take that approach. We went legal from day one. And we we negotiated and negotiated and negotiated and was very slow is very frustrating. We were angry at seeing other companies taking shortcuts and seeming to get away with it. Was this game theory thing where over many rounds of playing the game, this would be the right strategy. And even though clearly there's a lot of frustrations at times during negotiations, there is this there is this weird trust where we have been honest and fair.

We never screw them. They never screwed us. It's ten years. But this is trust. Like they know that if music doesn't get really big, if lots of people do not want to listen to music, I want to pay for it. Spotify has no business model, so we actually are incredibly aligned. Right.

Other companies not to be, but other companies have other business models. But even if they knew music for no money for music, they'd still be profitable companies. But Spotify wants. So I think the industry sees that we are actually aligned business wise. So there is this distrust that allows us to to do product development, even if it's scary, you know, taking risks. The free model itself was an incredible risk for the music industry to take that they should get credit for.

And some of that was that they had nothing to lose in Sweden. But frankly, a lot of the labels also took risk. And so I think we've built up that trust with a I think herding cats. Sounds a bit what's the word? It sounds like dismissive of the dismissive no everyday matter.

They're all beautiful and very important. Exactly. They've taken a lot of risks and certainly it's been frustrating on both sides. Yeah. So it's it's really like playing it's game theory. If you play the area, if you play the game many times, then you can have the statistical outcome that you bet on. And it feels very painful when you're in the middle of that thing.

I mean, there's risk, there's trust, there's relationships from just having read the biography of Steve Jobs, similar kind of relationship were discussed in iTunes. The idea of selling a song for a dollar was very uncomfortable for labels and. Exactly. And there was no it was the same kind of thing. It was trust. It was game theory, as is a lot of relationships that had to be built. And it's really a terrifyingly difficult process that Apple could go through a little bit because they could afford for that process to fail.

Or Spotify seems terrifying because you can't initially.

I think a lot of it comes down to, honestly, Daniel and his tenacity in negotiating, which seems like an impossible task because, you know, he was completely unknown and so forth. But maybe that was also the reason that that it worked.

But I think. Yeah, I think game three is probably the best way to think about it, you could go straight for this like Nash equilibrium, that someone is going to defect or or you play many times. You try to actually go for the top left, the cooperation.

So is there any magical reason why Spotify seems to have won this? So a lot of people have tried to do, Spotify tried to do and Spotify has come out well. So there's no magical reason because I don't believe in magic, but I think there are there are reasons and I think some of them are that. People have misunderstood a lot of what we actually do, the actual the actual Spotify model is very complicated. They've looked at the premium model and said, it seems like you can you can charge 999 for music and people are going to pay.

But that's not what happened. Actually, when we launched the original mobile product, everyone said they would never pay. What happened was they started on the free product and then their engagement grew so much that eventually they said maybe it is worth 999. Right. It's it's your propensity to pay gross with your engagement. So we had a super complicated business model. We operate two different business model advertising and premium at the same time. And I think that is hard to replicate.

I have, as I struggled to think of other companies that run large scale advertising and subscription products at the same time. So I think the business model is actually much more complicated than people think it is. And so some people went after just the premium part without the free part and ran into a wall where no one wanted to pay. Some people went after just music. Music should be free, just ads, which doesn't give you enough revenue and doesn't work for the music industry.

So I think that combination is kind of opaque from the outside. So maybe I shouldn't say it here and reveal the secret, but that turns out to be harder to replicate than he was then you would think. There's a lot of brilliant business strategy here.

Brilliance or luck, probably more luck, but it doesn't really matter. It looks brilliant in retrospect. Let's call it brilliant. Yeah. When the books are written, they'll be brilliant. You've mentioned that your philosophy is to embrace change. So how will the music streaming and music listening will change over the next 10 years, 20 years? You look out into the far future. What do you think? I think that music and for that matter, audio podcasts, audio books, I think it's one of the few core human needs.

I think there is no good reason to me why it shouldn't be at the scale of something like messaging or social networking. I don't think it's a nice thing to listen to music or news or something. So I think scale is obviously one of the things that I really hope for. I think I hope that it's going to be billions of users. I hope eventually everyone in the world gets access to all the world's music government. So obviously, I think it's going to be a much bigger business.

Otherwise we we wouldn't be betting this big out. Now, if you if you look more at how it is consumed. What I'm hoping is back to this analogy of the software toolchain where I think I sometimes internally I make this analogy to to text messaging. Text messaging was also based on standards in the area of mobile carriers. You had the estimates, the 140 character to an SMS, and it was great because everyone agreed on the standard. So as a consumer, you got a lot of distribution and interoperability, but it was a very constrained format.

And when the industry wanted to add pictures to that format to do the MMS, I looked it up and I think it took from the late 80s to early 2000s is like a 15, 20 year product cycle to bring pictures into that. Now, once that entire value chain of creation and consumption got wrapped in one software stack within something like Snapchat or WhatsApp, like the first week, they had a disappearing messages. Like then two weeks later, they added stories like the pace of innovation.

When you're on one software stack and you can you can you can affect both creation and consumption, I think it's going to be rapid. So with these streaming services, we now, for the first time in history, have enough, I hope, people on one of these services actually, whether it's Spotify or Amazon or YouTube and hopefully enough creators, that you can actually start working with the format again. And that excites me. I think being able to change these constraints from a hundred years, that could really that could really do something interesting.

I don't I really hope it's not just going to be the iteration. I'm on the same thing for the next 10 to 20 years as well.

Yeah, changing the creation of music or creation of audio creation of podcasts is a really fascinating possibility. I myself don't understand what it is about podcast that's so intimate. It's just as I listened to a lot of podcasts, I think it touches on a human and a deep human need for connection that people do feel like they're connected to when they listen. I don't understand what the psychology of that is, but in this world is becoming more and more disconnected.

It feels like this is fulfilling a certain kind of need. And empowering the creator as opposed to just the listener is really interesting, etc.. This is I'm really excited that you're working on this.

Yeah, I think one of the things that is. Fighting for our teams to work on podcast is exactly that, whether you think like I like, I probably do that it's something biological about perceiving to be in the middle of the conversation that makes you listen in a different way. It doesn't really matter. People seem to perceive it differently. And there was this narrative for a long time that, you know, if you look at video, everything kind of in the foreground, it got shorter and shorter and shorter because of financial pressures and monetization and so forth and events at the end, there's always like 20 second clip people just screaming something.

And I'm really I feel really good about the fact that you could have interpreted that as people have no attention span anymore. They don't want to listen to things. They're not interested in deeper stories like, you know, people are people are getting dumber. But then podcast came along and it's almost like, no, no, there need still existed once. But maybe maybe it was the fact that you're not prepared to look at your phone like this for two hours.

But if you can drive at the same time, it seems like people really want to dig deeper and they want to hear, like, the more complicated version. So to me, that is very inspiring, that that podcast is actually long form. It gives me a lot of hope for for humanity that people seem really interested in hearing deeper, more complicated conversations. This is I don't understand it. It's fascinating. So the majority for this podcast, listen to the whole thing, this whole conversation.

We've been talking for an hour and forty five minutes. And somebody will I mean, most people will be listening to these words. I'm speaking right now.

I wouldn't have thought that ten years ago with where the world seemed to go. So that's very positive. I think that's really exciting and empowering the creator. And there's as really exciting. Last question. You also have a passion for just mobile in general. How do you see the smartphone world? This the digital space of of smartphones and just everything that's on the move, whether it's Internet of Things and so on, are changing over the next ten years and so on.

I think that one way to think about it is that computing might be moving out of these multipurpose devices, the computer we had in the phone into specific specific purpose devices. And it will be ambient that, you know, at least in my home, you just child something at someone. And there is always like one of these speakers close enough. And so you start behaving differently. It's as if you have the Internet, ambient ambience around you and you can ask it things.

So I think computing will kind of get more integrated and one, we won't necessarily think of it as as connected to a device and the same thing in the same way that we do today. I don't know the path to that. Maybe we used to have these desktop computers and then we partially replace that with the with the laptops and left at home and at work. And then we've got these phones and we started leaving the the laptop at home for a while and maybe the maybe for stretches of time you're going to start using the watch and you can leave your your phone at home like for a run or something.

And you know, we're on this progressive path where you I think what what is happening with that voice is that you have you have an interactive interaction paradigm that doesn't require as large physical device. So I definitely think there is a future where you can have your your airports and and your watch and you can do a lot of computing. And I don't think it's going to be this binary thing I think is going to be like many of us still have a laptop.

We just use it less. And so you shift your consumption over and I don't know about a hourglasses and so forth. I'm I'm excited about I spend a lot of time in that area, but I still think it's quite far away. After all, this virus is happening and working. I think the recent Occulus Quest is quite impressive. I think are further away at least that type of air, I think. But I do think your phone or water glass is understanding where you are and maybe what you're looking at and being able to give you audio cues about what you can say, like what is this?

And it tells you what it is that I think might happen. You know, you use your your watch your glasses as a as a mouse pointer on reality. I think it might be a while before I might be wrong. I hope I'm wrong. I think it might be a while before we walk around with these big glasses, then project things. I agree with you. There's a it's actually really difficult when you have to understand the physical world enough to project onto it.

Well, I lied about the last question because I just thought of audio and my favorite topic, which is the movie her. Hmm. Do you think? Well, there's part of Spotify or not will have I don't know if you've seen the movie her. Absolutely, and their audio is the primary form of interaction and the connection with another entity that you can actually have a relationship with. You fall in love with based on voice alone, audio alone.

How far do you think that's possible? First of all, based on audio, long to fall in love with somebody, somebody or. Well, yeah, let's go with somebody. Just have a relationship based on audio alone. And second question to that. Can we create an artificial intelligence system that allows one to fall in love with it and hurt him with you?

So there's my personal personal answer. Speaking for me as a person, the answer is quite unequivocally yes. OK, on on both. I think what we just said about podcasts and the feeling of being in the middle of a conversation, if you could have an assistant where and we just said that feels like a very personal setting. If you walk around with these headphones in this thing, you're speaking with this thing all of the time that feels like it's in your brain.

I think it's. It's going to be much easier to fall in love with something that would be on your screen. I think that's entirely possible. And then from there, you can probably guess better than me. But from the concept of if it's going to be possible to build a machine, that they can achieve that. I think whether you whether you think of it as if you can fake it, the philosophical zombie that is assimilated enough or somehow actually I think there is.

It's only because if you if you ask me about time, I had a different answer. But if you say I've given some half infinite time, absolutely. I think it's just atoms and arrangement of information. Well, I personally think that love is a lot simpler than people think. So we started with true romance and ended in love. I don't see a better place to end. Beautiful. Thanks so much for talking today. Thank you so much.

It was a lot of fun as fun.