So I've always been a big fan of video game music, and have a somewhat hefty playlist on Youtube to prove it http://www.youtube.com/playlist?list=PLEF543D447DA8191D. Now for me the best video game music helps a great game incite emotion from the player, be it excitement, fear, sadness or confidence. To that end I would say that my favorite ever piece of game music is Atolm Dragon from Panzer Dragoon Saga:
It may not be technically amazing by todays standards but at the time it was almost in a league of it's own. Not only is it a very good track but it would also only play in a select few places in game. First it played in the intro of the game as shown above, which at least for my young self got me real excited to play the game, but second it would play during fights against Atolm Dragon, one of the more significant bosses in the game, in which it invoked a sense of fear and anticipation as you fought against your nemesis.
All of which brings me to my question. What is your single favorite video game track and why? Is it because it elicits an emotional response as I detailed above, or simply because it was a piece of music that blew your mind?