Zelda 3 - Darkworld Jazz
Zelda 3 - Lost Woods South Central
Castlevania 4 - The Belmont Chill
MegaMan 3 - Magnet Man Goes West
MegaMan X - Airbased
Super Ghouls 'N Ghosts - Swimming In Zombie Guts

All of them downloaded at ocremix.org

And, of course, Mr.Bungle - Super Mario Bros. Theme