See also:
Best VGM 630 - http://www.youtube.com/watch?v=sxcTW6DlNqA
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
Super Adventure Island (1992)
Dark Castle of Living Things / Darkside Visitor
Yuzo Koshiro