All cheats work for PS2 - Wii - XBOX 360 game systems! All you have to do is type them in correctly.
I finally came across some cheats for Guitar Hero 3. Check em out. If you know of any other ones leave them in the comments and I will add them.
Enter all Cheats into the cheat menu.
Key:
Y = Yellow
B = Blue
O = Orange
G = Green
R = Red
( ) = Letters in Parentheses are to be hit at the same time when entering cheats.
Here is what we have so far.
Air Guitar:
(YB) (GY) (GY) (RB) (RB) (RY) (RY) (YB) (GY) (GY) (RB) (RB) (RY) (RY) (GY) (GY) (RY) (RY)
HyperSpeed:
OBOYOBOY
Performance Mode:
(RY) (RB) (RO) (RB) (RY) (GB) (RY) (RB)
Precision Mode:
(GR) (GR) (GR) (RY) (RY) (RB) (RB) (YB) (YO) (YO) (GR) (GR) (GR) (RY) (RY) (RB) (RB) (YB) (YO) (YO)
No Fail:
(GR) B (GR) (GY) B (GY) (RY) O (RY) (GY) Y (GY) (GR)
Easy Expert:
(GR) (GY) (YB) (RB) (BO) (YO) (RY) (RB)
Bret Michaels Character:
(GR) (GR) (GR) (GB) (GB) (GB) (RB) R R R (RB) R R R (RB) R R R
Large Gems:
G R G Y G B G O G B G Y G R G (GR) (RY) (GR) (YB) (GR) (BO) (GR) (YB) (GR) (RY) (GR) (GY)
Unlock All Songs (Permanent):
(YO) (RB) (RO) (GB) (RY) (YO) (RY) (RB) (GY) (GY) (YB) (YB) (YO) (YO) (YB) Y R (RY) R Y O
Unlock Everything (Permanent):
(GR_BO) (GRYB_) (GRY_O) (G_YBO) (GRYB_) (_RYBO) (GRYB_) (G_YBO) (GRYB_) (GRY_O) (GRY_O) (GRYB_) (GRY_O)
Thanks to ScoreHero.com, The Black Cat, and Steve for helping fill this section.
If we are missing anything please feel free to leave it in the comments and I will add it.