I think someone could probably do a good job mixing music with gameplay if they shifted the music in and out with game sounds -- for example, there's a lot of noises that go on in game that can be mixed into the music with the right beats and cadence. Plus, it would give a different edge to the game if the music is rushing along, then suddenly it pauses for a call out of a predator missile, or an explosion, with some editing to highlight what happened.
Just plain music is a little boring (except to show off the music) since to me the game play is enhanced by the sounds its makes already or someone talking about what's going on.