When it says "Press Start" hit Yellow, Red, Red, Red, Blue, Yellow, Blue, Blue, Blue. This cheat can only be used in quick play.
With the drums, hit Red, Blue, Blue, Yellow, Red, Yellow, Blue, Red, Red, Blue, Yellow. Use this cheat when the screen says "Rock Band Press Start".
No Fail Cheat
With the drums hit red, red, blue, yellow, orange, blue.
With the guitar hit Red, Orange, Green, Blue, Yellow, Red, Green.
Unlock All Songs
Quickly press Red, Yellow, Blue, Red, Red, Blue, Blue, Red, Yellow, Blue at the
title screen when "Press Start" appears. Enabling this code will disable game saves.