Press Blue, Yellow, Orange, Red, Orange, Yellow, Red, Yellow, Red, Yellow, Red, 
Yellow, Red, Yellow, Red, Yellow at the main menu to unlock all guitars, songs, 
videos, and cheats. Saving the game will be disabled, and you must turn off the 
Xbox 360 to disable its effect.

In the PAL version, press Blue, Yellow, Orange, Red, Orange, Yellow, Blue, Yellow, 
Blue, Yellow, Blue, Yellow, Blue, Yellow, Blue, Yellow at the main menu.