I'm listing to Spotify all day while writing code, listening to playlists like "Discover Weekly" or the "Radio". I find that some songs often make me much more productive than others. With all the data you collect, you could easily determine what songs are playing while I'm "productive" --such as while an editor (Atom) is open for a period of time. Then, those songs could get added to a "productive" playlist that I can use later when I need to really focus.

The problem currently is that we don't know what songs are playing when we are super productive because the truly great songs making us productive don't distract us, and thus never get added to a playlist as "productive" songs; they just keep playing in the background acting as a muse.