Currently song manipulation is only possible through the hover over a couple of buttons. This is a very poor user experience. 1. When the window is maximised, I need to travel several parsecs to do something on a song. 2. It is not obvious that these are buttons, I expect buttons to be somewhat discoverable Because of these reasons, these should be moved into a context menu, and very basic options like add to playlist should be on the left side of the song title and always visible.
There is a context menu when the view is narrow and there isn't enough room for hover buttons. We could potentially add a context menu too. The issue of buttons not being recognizable as buttons is quite valid though; I'll change that. In general we make hover buttons and buttons that cover content use a raised appearance, not a flat appearance.