The code, should be about 6 characters long, should have been emailed to you after you preordered on Best Buys website. It then redirects you to disturbed's website to claim a Microsoft code. Did you pre-order from Best Buy's website? If not you won't get a code.
I just preordered and the code they give is good for only 3 tracks. They send you a code in an email and redirect you to a page where you can get a live code to redeem. http://disturbed1.com/xbox/
Fanswag: Win a copy of Castle Crashers [update]
Aug 28th 2008 12:39PM (Joystiq Xbox)Rock Band DLC: Jimmy Buffett and Disturbed
Jun 3rd 2008 7:50PM (Joystiq Xbox)Rock Band DLC: Jimmy Buffett and Disturbed
May 31st 2008 1:38PM (Joystiq Xbox)Rock Band DLC: Jimmy Buffett and Disturbed
May 30th 2008 10:27PM (Joystiq Xbox)Fanswag: Battlefield: Bad Company demo codes [update]
May 29th 2008 8:46PM (Joystiq Xbox)New GHIII tracks with international flair
Aug 22nd 2007 5:38PM (Joystiq Xbox)COD4 beta listing clarified, coming "soon"
Aug 17th 2007 7:21PM (Joystiq Xbox)Fanswag: Halo 3 beta T-shirt Giveaway Day 6
May 30th 2007 2:10PM (Joystiq Xbox)boo-yah!
-now it is forever pitched back into the cultures of yesteryear.