Unlock Everything:
Press GR_BO, GRYB_, GRY_O, G_BYO, GRYB_, _RYBO, GRYB_, G_YBO, GRYB_, GRY_O, GRY_O, GRYB_, GRY_O (because this code uses 4-note chords there will be no sound).
We have more cheats and tips for this game here, Guitar Hero 3: Legends of Rock cheats
Comments for this cheat