Guitar Hero 3 Cheats[GamerScore +++]

[Nexusg7]

Here is the all songs cheat
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Press Yellow + Orange, Red + Blue, Red + Orange, Green + Blue, Red + Yellow, Yellow + Orange, Red + Yellow, Red + Blue, [Green + Yellow] two times, [Yellow + Blue] two times, [Yellow + Orange] two times, Yellow + Blue, Yellow, Red, Red + Yellow, Red, Yellow, Orange to unlock all songs in Quick Play mode.

Here is the code that unlocks and buys everything in career mode (also gives you the achievements for you xbox live users!)
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Press [Green + Red + Blue + Orange], [Green + Red + Yellow + Blue], [Green + Red + Yellow + Orange], [Green + Blue + Yellow + Orange], [Green + Red + Yellow + Blue], [Red + Yellow + Blue + Orange], [Green + Red + Yellow + Blue], [Green + Yellow + Blue + Orange], [Green + Red + Yellow + Blue], [Green + Red + Yellow + Orange], [Green + Red + Yellow + Orange], [Green + Red + Yellow + Blue], [Green + Red + Yellow + Orange]. Note: There will be no sound while entering the four note "chords". Enter the shop in Career mode to access all items.

No Fail code (my favorite for expert "through fire and flames")
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Press Green + Red, Blue, Green + Red, Green + Yellow, Blue, Green + Yellow, Red + Yellow, Orange, Red + Yellow, Green + Yellow, Yellow, Green + Yellow, Green + Red.

[lord-zach]

hey sorry for posting in an old thread but.. where do you press the buttons? at the main menu or what?

[XplittR]

You go in Main Menu -> Options -> Cheat Codes