I've found a real music gem, and that in a place where you wouldn't suspect it: The opening menu theme in Civilization 4. The background track (which could be very well the main theme for a major blockbuster movie! And they have put it as the menu background!) is Baba Yetu by the composer Christopher Tin.
You've gotta hear this song. It's really incredible, perfectly sung by Stanford Talisman. Let's hope that this incredibly talented Christopher Tin will continue to provide songs like this, I'd buy an album full of this right away.
[Update] Until the album comes out, you can download this song for free on his page. Don't miss this chance!