and few other ux, ui improvement suggestion:
first off the scrollbar, when you select a song it highlights, and because of the scrollbar background is white the highlight seems like it's been cutoff. It would be better to have the scrollbar overlapping over the content.
and the sound icon would be better off on the other side, currently in the
track with thumbnail view the playing track's song name and artist name is pushed a bit to the side so that the icon can fit, but this creates a bit of inconsistency. For other views it is okay, as they don't only push the plaing track's name to side, but all of the other tracks as well.
Also maybe smooth scrolling?