That both has and hasn't happened with Spotify. On the one hand, there are no 10 hour songs with some great part spread out randomly throughout that listeners

That both has and hasn't happened with Spotify. On the one hand, there are no 10 hour songs with some great part spread out randomly throughout that listeners have to find (obvious, and I think such a book wouldn't be successful either). On the other hand there are tons of generated crap on Spotify, than sometimes sneaks into your playlists (even things contained text-to-speech advertisement). I think all such platforms would need some kind of spam filter functionality and a good rating / statistics system so that quality content could be surfaced.