[Adder]

All of megaman 1, 2, 3 ; megaman x 1 and 2

Castlevania 1, 2, 3, and 4

DKC 1, 2, and 3

http://www.youtube.com/watch?v=7kB6OXGVJ...7A712BC8DB

http://www.youtube.com/watch?v=zP_D_YKnw...re=related

http://www.youtube.com/watch?v=VQkgaUbgCCo <--- the best music in any game


Edit -- Almost forgot, Super meat boy has a great OST as well if you are like me and like 8 and 16-bit era soundtracks.


If we are talking about covers as well

http://www.youtube.com/watch?v=OoAe8F1wn3k
http://www.youtube.com/watch?v=LHbYIbleQ...re=related

http://www.youtube.com/watch?v=4jlU1rq58...re=related


Anything by The Advantage

Anything by The Black Mages


This dude has covered pretty much all of the megaman songs I mentioned on guitar

http://www.youtube.com/user/cezarbatistao#p/u