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You know, most of the good music in my opinion (you don't have to agree with me, dammit) usually comes from the Sonic, Mario and Zelda series.

I just keep pumping the tunes from Sonic 3 out!

Mario series
Sonic series
Donkey Kong Country series
Anything Neil Voss composes

Every song from Goldeneye 007.
The Robotnik battle music from STH:3 (I believe they use the same song for S+K... but I'm not sure)
The Fourside song from Earthbound (Earthbound > your favorite game)
SSBM's remix of Fourside

all that crazy shit from Tony Hawk's Pro Skater series!
everything is awsome!

go seach google for em you'll find it on the first page i've tried

The Musical Score for Sudeki

This one is about as good as the Fable soundtrack, a very lively sound that was influenced with fantasy. Very imaginative, you will love it.

If you like ochastras then the Final Fantasy X soundtrack is very good. I have it, four hours of great tunes (Actually the first disc sort of sucks, but it makes up for it). Anything by that Nobou Uestima (I probably butchered his name) is great music.

Other music I would mention would be MGS3 or Zelda: OOT. Great soundtracks. And if liscenced music counts THPS3's is the best.