I haven't really listened to the other soundtracks of the Halo series, but the one for the 2nd game in the series really gripped me, with both Peril and Impend being stand out tracks for me.
I thought of one more soundtrack, the one for Shadow of the Colossus. MoMy favourite of the bunch is the
EDIT:
denseWorm said:
I've been waiting for someone else to write something so i won't triple post -- I can't believe no one has said this one:
I was thinking of posting the Civ 4 one as well, but you beat me to it, once again: