I only listen to Orchestra. Anything else (jazz, blues, bluegrass, rap, country, reggae, industrial etc.) won't do it for me and hurts my ears. Kinda unusual for a Czech Man who goes weightlifting every week, but that is just the way it is.
I despise the Halo games, just like any ego-shooters, adventures and jump'n'roses, but the music is the only good thing. No boring rock'n'roll, only orchestral pieces