Okay, this is gonna be a pretty big list...hmmm, let's see...:
Auron's theme
To Zanarkand
Suteki Da Ne (both versions)
The music when you fight Seymour for the last time
Yuna's theme
Tidus' theme (It made me cry)
People of the North pole (Mt Gagazet) or whatever you wish to call it
OTHERWORLD!!! THAT ROCKS! (I'm listening to it at the moment)
Someday the dream will end
Besaid Island

That's all that I can remember on a spur of the moment thing.
"Go into the sand and the dust and the sky..."