The prolific composer Jack Wall will be droppin' mad orchestral beats on the soon-to-be-released Mass Effect2, according to a recent EA press release. Though you may not be familiar with the name, you're probably familiar with his work -- Wall produced the scores for Jade Empire, Splinter Cell, Myst III and co-composed the accompaniment for the original Mass Effect. So, you know he's already got experience with theremins and other sci-fi synthesizers, which is important for this kind of work.
If you need something ambient to listen to during your daily chamomile bath, the soundtrack will also be available to download from the usual online retailers on January 19. Or you could just, you know, leave the game running in the other room with the volume turned way up. Your choice!