Just noticed that Ctrl+Space is used in another context as well:
Probably should be changed as well and also this doesn't currently work anyway as Ctrl+Space just play/pauses. Unless I'm missing something.
EDIT 2: It does works in the edit lyrics dialog. I was mistaken about what the shortcut is for. Maybe the tab title in the shortcuts dialog can be changed to "Synced Lyrics Editor" or something like that. Otherwise, this works fine and doesn't clash with the player controls.

manan-gup commented
The
Ctrl+Spaceshortcut for play/pause interferes with keyboard navigation as that's the exact key combination you'd use for multi-selecting in lists. Right now you can multi-select via keyboard if you navigate viaCtrl+Up/Down Arrowand then unpressCtrland pressSpace.GNOME HIG suggests using
Ctrl+Letterfor shortcuts and Amberol usesCtrl+P:๐ image
Fig: Shortcut dialog from Amberol