Run a Plex server, and you can stream your own library of music from anywhere (one-time $5 purchase for your mobile app). Of course, this doesn't solve the issu

Run a Plex server, and you can stream your own library of music from anywhere (one-time $5 purchase for your mobile app). Of course, this doesn't solve the issue of recommendations, but I personally see discovery and collection as two different roles which can be filled by two different models/services.