What is your favorite video game soundtrack?

Some of my favorites are the soundtracks for the Halo series (With Halo 3 being my favorite) The Mass Effect series (Mass Effect 3 is a personal favorite) Bioshock 1 and Bioshock 2, Red Dead Redemption, Assassins Creed 2, Sonic CD, Shenmue, Call of Duty Modern Warfare 2, Medal of Honor: Allied Assault and Medal of Honor (2010), What are some of your favorites?