I don’t support cheating in any way. So I am putting these cheats after the jump, so if you see them, you are a down right cheater! Shame on you shame, shame.  Now I am going to go try these cheats out. ; )

G=Green, R=Red, Y=Yellow, B=Blue, O=Orange.

Games Cheat Effect;

(YO) (RB) (RO) (GB) (RY) (YO) (RY) (RB) (GY) (GY) (YB) (YB) (YO) (YO) (YB)

Y R (RY) R Y O Unlock all songs in Quick Play
RY) (RB) (RO) (RB) (RY) (GB) (RY) (RB) Performance Mode
GR) (GR) (GR) (RY) (RY) (RB) (RB) (YB) (YO) (YO) (GR) (GR) (GR) (RY) (RY)(RB) (RB) (YB) (YO) (YO) Precision Mode
(BY) (GY) (GY) (RB) (RB) (RY) (RY) (BY) (GY) (GY) (RB) (RB) (RY) (RY) (GY) (GY) (RY) (RY) Air Guitar
(GR) B (GR) (GY) B (GY) (RY) O (RY) (GY) Y (GY) (GR) No Fail (does not

work in career mode)
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) Large Gems
(GR) (GY) (YB) (RB) (BO) (YO) (RY) (RB) Easy Expert (does not work in

Career mode)
(GRBO) (GRYB) (GRYO) (GYBO) (GRYB) (RYBO) (GRYB) (GYBO) (GRYB) (GRYO) (GRYO) (GRYB) (GRYO) Unlock Everything (no sound plays when you enter these chords)