See also:
Best VGM 354 - http://www.youtube.com/watch?v=fH-lLbHbG-A
Best VGM 593 - http://www.youtube.com/watch?v=b3l5v-QQF40
A collection of my favorite videogame music. Note that most of them are from games I played so I might miss some great ones from games I never played.
SNES
TMNT IV: Turtles in Time (1992)
Bury My Shell at Wounded Knee
Mutsuhiko Izumi
