Yes! In the game's folder in Audio and the various subfolders (BGM is where most stuff is), most songs are named after the composter/game they're from, the console, and their title/track. There are some exceptions as I've had to replace some songs to avoid copyright claims or didn't name the right originally but these are listed in credits.txt in the main game folder.
Gary's battle is specifically the boss song from Plok!, where I take like three songs because it's an awesome soundtrack. Rest in peace, Geoff Follin.