Secret Guitars

Snaketapus Guitar: Complete Hard Mode.
The Log" Guitar: You must achieve 5-Star every song on Expert.
Battle Axe Guitar: Complete Expert Mode.
Casket Guitar: Complete Medium Mode.
Eyeball Guitar: You must achieve 5-Star every song on Hard.
Fish Guitar: Complete Easy Mode.
USA Guitar: You must achieve 5-Star every song on Easy.
Viking Guitar: You must achieve 5-Star every song on Medium.

Cheat Lists
Air Guitar: Y, Y, B, O, Y, B
Crowd has Eyeball Heads: B, O, Y, O, Y, O, B
Crowd has Monkey Heads: O, B, Y, Y, O, B, Y, Y
Flaming Head: B, O, Y, O, O, Y, O, Y, Y
Horse Head: O, O, B, O, O, B, O, O, B
Hyper Speed De/Activate: O, B, O, Y, O, B, O, Y
Performance mode: Y, Y, B, Y, Y, O, Y, Y