Some Rock Band songs that were available to download were plagued by bugs. The problems have been patched up on the 360 (when you fire up the game, you will be notified) and the patch will appear for the PS3 on the 28th.
The following songs will have to be deleted and re-downloaded:
- Can’t Stand Losing You
- Synchronicity II
- Police Pack 01
- Brass in Pocket
The songs have been reassigned to the right categories and the bug concerning vocal volumes being set all the way down yet still audible has been fixed.
For instructions on how to redownload view this forum post on the Rock Band website.