I might be stupid or missing something, but I cannot figure out how to redeem the code I was mailed for the free DLC.
It's a 12 digit alphanumeric.
The email says
"In order to redeem your code, please follow the instructions for your console (Xbox 360 or PlayStation 3). Please note that your download code will only work for the brand of console for which you purchased and registered Rock Band 2:
Xbox 360 users: go to Xbox Live Marketplace and select the Redeem Code option. Enter the code presented above to download your tracks.".
The only place I see to enter codes will only accept 25 digit codes, such as the track pack codes.