Have you actually heard the Halo soundtracks? For a videogame, its really actually quite nice (Except for a couple of songs which sound like an elephant with waaaaaaay too much caffine in his system was having a siezure and trying to play electric guitar and that sould was passed through two cheep walkie-talkies on either side of a cage of really loud monkies and then modified using the most annoying syntesizer possible....)
Although, its kind of heavenly music considering you're a 7 foot, 1/2 ton cyborg with inpenetrable armour and a rocketlauncher and energy sward and you are chopping everyone to tiny bits....
I'm listinging to one of the songs right now, "High Charity: the Pursuit of Truth"