Nintendo games generally have awesome tracks
Favourites include:
The Legend of Zelda, specifically Wind Waker, specifically The Great Sea, Dragon Roost Island, Molgera and the credits theme
Metroid and Metroid Prime, with particular attention payed to the title and credits themes of both games.
Speaking of credits themes, I've got science to do. We do what we must, because we can.
The Kirby games are truly awesome, favourites include Green Greens from Kirby's Dreamland and Dedede's Theme.
Earthbound is in a class of its own. You have to hear the music to believe it.
While we're talking about Earthbound, Melee's renditions of Pollyanna and Bein' Friends/Mary's Theme are ASTOUNDING
And finally, last, but definitely NOT least, we have Doukutsu Monogatari, known as Cave Story, one of the best games I've played since ever, with tracks that make Route 1 forgettable by comparison.