Are there any cheats for guitar hero 3 on PS2, and if they are, what are they?

Thanks in Advance!

Guitar Hero III: Legends of Rock for PlayStation 2 Cheats - Guitar Hero III: Legends of Rock Codes - Guitar Hero III: Legends of Rock Cheat Codes, FAQs, Walk-Throughs, Hints (http://www.gamespot.com/ps2/puzzle/guitarheroiii/hints.html)