I have three games that have really good soundtracks. The first two are from Zone of the enders, and Zone of the enders 2. Now ones and a while you can find there soundtracks, so if you really like it you can try to find the official copy's. Now the next game Star Wars Republic Commando, I have never been able to find a official copy for its soundtrack.
Zone of the enders
http://downloads.khinsider.com/game-soundtracks/album/zone-of-the-enders-original-soundtrack
Zone of the enders 2
http://downloads.khinsider.com/game-soundtracks/album/zone-of-the-enders-the-2nd-runner-original-soundtrack
Star Wars Republic Commando
http://downloads.khinsider.com/game-soundtracks/album/star-wars-republic-commando
