Pride FC theme on repeat1.
No joke. . .
But if I somehow get sick of that then:-
Creed - Bullets
Disturbed - The Game
Eminem - Lose Yourself
Eric Martin - Last Man Standing
In Flames - Ordinary Story
In Flames - Cloud Connected
Papa Roach - Last Resort
Rob D - Furious Angels
System of a Down - Chop Suey
The Prodigy - No Good
The Prodigy - Poison
Van Halen - Right Now
Some
Ministry,
The Mad Capsule Markets or
Nine Inch Nails sometimes too. Not often though.