I'm not a fan of heavy-electric guitar, although when turned down in the back ground it doesn't annoy me too much. I think it would be cool if you heard music from one of the franchise's depending on what character you were playing. Raynor for example would play some SC music (maybe re-vamped a little or tweaked for the game) and so on with every other character. That might not be as stale as the same guitar tune on repeat.