These codes use the buttons on the guitar controller. Enter them at the main menu.
Master code (Unlock Everything):
Press Yellow, Orange, Blue, Blue, Orange, Yellow, Yellow. NOTE: The game can't be saved after this code is entered.
Air guitar:
Press Orange, Orange, Blue, Yellow, Orange.
Toggle no venues:
Press Blue, Yellow, Orange, Blue, Yellow, Orange.
Monkey audience:
Press Blue, Orange, Yellow, Yellow, Yellow, Blue, Orange.
Skull audience:
Press Orange, Yellow, Blue, Blue, Orange, Yellow, Blue, Blue.
Guitarist always plays Guitar Hero SG:
Press Blue, Orange, Yellow, Blue, Blue.