I gave this a lot of thought, and this is what I came up with as a (metal) soundtrack at least for season one. Thirteen is a good number, no?
1. Ozzy Osbourne - Crazy Train
2. Metallica - The Thing That Should Not Be
3. Korn - Bitch We Got A Problem
4. Marilyn Manson - Sweet Dreams
5. Pantera - Drag The Waters
6. Disturbed - Land of Confusion
7. Black Sabbath - Black Sabbath
8. Drowning Pool - Bodies
9. Slipknot - Everything Ends
10. Type O Negative - Everything Dies
11. Slayer - South of Heaven
12. Dope - Die Motherfucker Die
13. White Zombie - Children of the Grave
What would be on yours?