[Jonk]

I like how the minimize arrow works to change the window to an icon. I did not initially get how to quickly show/hide the window. Very clever.
A few ideas  that may be nice...

1. If the library window could be automatically minimized after a song is loaded.  
2. When the window is restored it forgets its scrolled position. (if I was on "K" it reverts to songs starting with "A")
3. If there was a way to pull the window to load a requested song while in the middle of a setlist, and keep place in the set list, to keep going after playing a request, would be fantastic. (Get a song request. Play it. Continue with the Setlist) Maybe by using the back arrow. 
4. A search filter would be very useful.

Anyhow, Great work Mike!