The soundtrack for Tomb Raider: Underworld, composed by Colin O’Malley and Troels Folmann has been released as a free download. I haven’t listened to it yet, and I’ve only played the demo, but what I heard sounded good.
Troels Folmann did some excellent interactive scoring for Tomb Raider: Legend and rightly got a BAFTA award (Best Original Score) for it.
Check out this excellent interview with Troels about micro-scoring for games. It’s a very interesting read.