I remember way back when playing Tony Hawk's Underground 2 and loving the soundtrack so much, I decided to literally write down a list of all the songs to download them. Not everything stuck of course but The Distillers is one of my favorite bands of all time now because of their song "Beat your Heart Out." Brody Dalle herself is one of my favorite human beings, honestly.
Through Rock Band and guitar hero, I also discovered Muse and Lacuna Coil, which are two of my favorite bands to this day. Have you discovered some of your current favorite music through game soundtracks?