This is a cool collection of (almost) all the songs from Super Mario 64! It also has catchy remixes of old songs from the older Mario games (tracks 2, 14, 16, 17, and 34)!
My favorite is track 29, "Koopa's Road". Koji Kondo did an awesome job of composing a song that would build up suspense for your confrontation with Bowser! It's kind of like a fast-paced marching song, with just a slight bit of humor (i.e. a "twanging" noise that's heard when the song really puts in emphasis). Also, about 15 seconds after the song begins, it comes to a second-long halt, which also creates a feeling of fear.
I've discovered that, unless I'm mistaken, this CD is missing only one short song from the game - the little three-second ditty that's played when Mario arrives right in front of the castle and Lakitu shows up. Oh, well. But it's got a track on it that isn't found in the game, a beautiful piano rendition of "Piranha Plant's Lullaby" on track 36.
To sum it all up, this CD is nothing short of awesome.