Awesome soundtracks

This is a list of games that all have amazing soundtracks that stand out in one way or another to me. 
It might be anything from super-catchy and memorable to hauntingly beautiful and moving, or just simply music that fits in extremely well with the actual game.

List items

Posted by ahoodedfigure

Great choices here.  Favorite Sonic 2 track?

Posted by Tordah
@ahoodedfigure: Thanks! Hmm, hard to pick just one but Casino Night Zone is pretty damn rad.
Posted by ahoodedfigure
@Tordah: For me it's probably Chemical Plant, although I also remember that stage being a pain in the butt.