The final boss music from Final Fantasy 6, 9, and 4, in that order. They're so good I pick up the game and beat the final boss all over again just so I can listen to the music.
Edit: I can't believe I forgot Chrono Trigger. It's probably because of the weak port of that particular track in the DS version.
Edit: I can't believe I forgot Chrono Trigger. It's probably because of the weak port of that particular track in the DS version.