Rock Band 3

					
Cheats:
Unlock the Ovation D-2010 guitar:

Using the guitar, press Orange, Blue, Orange, Orange, Blue, Blue, Orange, Blue at the main menu.
Unlock the Stop! guitar:

Using the guitar, press Orange, Orange, Blue, Blue, Orange, Blue, Blue, Orange at the main menu.
Unlock the Guild X-79 guitar:

Using the guitar, press Blue, Orange, Orange, Blue, Orange, Orange, Blue, Blue at the main menu.