There are a couple composers on this site, but Jason "Jaybot" Surguine is the only musician I know personally. If there is a "jack of all trades" for music, he is that person. Instead of forcing his style of music into a game, he models the music to match the mood.
His music and audio achievements in Snails have been applauded by all critics and reviewers, as well as fans. One of his first works was Argentum (way last summer) and his newest feats will appear in Speedway Jam. There are a few other titles tucked in there as well... you can download some samples from his site at