Cheat: Codes

Enter the following codes in the game mode selection menu.
Monkey Headed Crowd
Blue, Orange, Yellow, Yellow, Yellow, Blue, Orange.
Skull Headed Crowd
Orange, Yellow, Blue, Blue, Orange, Yellow, Blue, Blue.
Play Using An Air Guitar
Orange, Orange, Blue, Yellow, Orange.
Disappearing Arena
Blue, Yellow, Orange, Blue, Yellow, Orange.
Rock meter always green
Yellow, Blue, Orange, Orange, Blue, Blue, Yellow, Orange.

Cheat: Unlockables

Enter the following codes in the game mode selection menu
Hero Guitar
Blue, Orange, Yellow, Blue, Blue.
Unlock All
Yellow, Orange, Blue, Blue, Orange, Yellow, Yellow.
The Battle Axe
Finish Career Mode on Expert Difficulty.