Wii Unreadable disc error

[jenwar]

Both my rock band 1 and 2 disc's played fine, until I picked up the wireless drum kit for RB 2. Now RB 1 gives me the error as soon as the game loads and I can maybe get through half a song on RB 2 before I get the error. But my AC DC disc plays fine. Both RB 1 and 2 disc's are clear with no scratches.