The song "Late at Night" uses the following sound files from ccmixter.org: Azoora / CC BY 3.0
as well as the following files from freesound.org:
tk 4 40.wav, tk 4 21.wav, tk 4 37bfastamp.wav, and efs 11.wav from ERH
and of course pianoloop.wav from pryght one
Thanks, guys! Creative Commons is the way to go!