At the 'Main' menu quickly enter the following codes to enable the corresponding effect, if you have entered the code in correctly you will see a confirmation message on screen. Repeat the code to disable the effect.

Unlock ALL:
Enter Yellow, Orange, Blue, Blue, Orange, Yellow, Yellow.

Rock Meter Always Stays Green:
Enter Yellow, Blue, Orange, Orange, Blue, Blue, Yellow, Orange.

Unlock Hero Guitar:
Enter Blue, Orange, Yellow, Blue, Blue.

Player uses Air Guitar:
Enter Orange, Orange, Blue, Yellow, Orange.

Venue Disappears:
Enter Blue, Yellow, Orange, Blue, Yellow, Orange.

Crowd has Monkey Heads:
Enter Blue, Orange, Yellow, Yellow, Yellow, Blue, Orange.

Crowd has Skull Heads:
Enter Orange, Yellow, Blue, Blue, Orange, Yellow, Blue, Blue.

You will get this status when you complete ALL the songs including the Bonus tracks in Normal, Hard and Expert modes with a five star rating.

You will need to Complete:

Career Mode on Expert Difficulty.