Super Mario Galaxy - "Credits" -- Completed and on site (http://www.ninsheetm.us/browse/series/SuperMario)
Okay, I'm going to do something really annoying by posting credits songs - not only are they usually hard to arrange, but they're very long as well.
Super Mario Galaxy - Staff Credits (http://www.youtube.com/watch?v=0VIkZFu-GV8)
Mario and Luigi: Bowser's Inside Story - Staff Credits (http://www.youtube.com/watch?v=_QC8E9Q4gJM&feature=related)
:P Just requests, don't take them too seriously if it's a hassle...
The SMG Credits theme has been on the site for some time. It's called "End Title Duet".
Really? :o Thanks Cobra, guess I didn't see that. Now I need to find someone to play it with. .__.