Well, I would say that my real idea it is two new music playing options.
The first of these ideas we could call it an auto switch off mode or time trial mode. I reached to this idea when I hear music many nights in my life to relax and fall sleep. And it is very uncomfortable when you are relaxed and almost dreaming, and you have to "wake up" again and have to get out of Spotify's app. So then I got the idea that it could have the option that you set the time to stop the music and get out of the app by It self.
The second option that I was talking about I reached it when I was exploring new music on new playlist and saw many playlist with the songs that I already had. And I thought about a new option that allowed you to only play (or only add to your playlist) the songs that you dont already have on them.