Wanted to note that the player is spoiled for music (220 tracks!) and I'll definitely be separating them out to keep, but I feel that in this case, it is a bit too much of a good thing. With no default background track for situations, I often find myself browsing for several minutes through the tracklist for "that" song that fits.
My feeling is that it would have been best to have default background tracks, with the option to use the UI music player to chose a different track to play if the default isn't to your liking, although I don't know coding nor how hard this would be to change. It may have been due to being alpha state, but 10/11 has no appropriate music for the Oppai Club.
There are also times when the UI is not accessible at all, so you can't change the track, unless you rollback to the last point where you could.