Playback Space
Space to play or pause.
Works everywhere,
except while editing text.
Esc stops and rewind.
Select next song
Skip songs by moving
the bar with ↑↓
Even during playback.
Everything goes
Add, delete or re-order song
during playback with
InsDel and Ctrl↑↓
Also works: CtrlI and CtrlD
Even load the next set with F5
while current set is playing.