Guitar Hero 2 - Platform: Playstation 2

Air Guitar:
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At the main menu press these buttons in quickly: 
Yellow, Yellow, Blue, Orange, Yellow, Blue.

Eyeball Head Crowd:
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At the main menu press in these buttons quickly: 
Blue, Orange, Yellow, Orange, Yellow, Orange, Blue. 
This will make everyone's head in the audience turn into a eyeball.

Flaming Head:
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At the main menu press in these buttons quickly: 
Orange, Yellow, Orange, Orange, Yellow, Orange, Yellow, Yellow. 
This cheat will give your character a head that is on fire.

Horse Head:
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At the main menu press in these buttons quickly: 
Blue, Orange, Orange, Blue, Orange, Orange, Blue, Orange, Orange, Blue. 
This will give your character a horse head.

Hyper Speed Mode:
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At the main menu press in these buttons quickly: 
Orange, Blue, Orange, Yellow, Orange, Blue, Orange, Yellow.

Make Grim Ripper play Gibson Les Paul:
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After unlocking the Grim Ripper, select him as your guitarist in Career mode, 
then exit Career mode. Next, go to Quick Play mode, choose any song at any 
difficulty, and either finish the song, or quit once it has started. 
Then, go back to Career mode, and the Grim Ripper will be playing the Gibson 
Les Paul with the Cherry Sunburst Classic skin! To make him play the scythe 
again, simply select it in the "Change Guitar" menu.

Monkey Head Crowd:
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At the main menu press these buttons in quickly: 
Orange, Blue, Yellow, Yellow, Orange, Blue, Yellow, Yellow. 
This will turn everyone's head in the audience to Monkey Heads.

Performance Mode:
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At the main menu press these buttons quickly: 
Yellow, Yellow, Blue, Yellow, Yellow, Orange, Yellow, Yellow.

Play The Scythe With (Almost) Anyone:
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First you must have Grim Ripper unlocked and select him. 
Then select another character. The character MUST have their other 
outfit unlocked. They will have the Scythe unless you change the guitar. 
Note: Since Clive Winston and Xavier Stone do not have an unlockable outfit, 
they can't play the Scythe.

Unlock Battle Axe:
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Successfully complete Expert mode.

Unlock Casket:
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Successfully complete Medium mode.

Unlock Eyeball:
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Get a five star rank on all songs in Hard mode.

Unlock Fish:
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Successfully complete Easy mode.

Unlock Snaketapus:
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Successfully complete Hard mode.

Unlock The Log:
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Get a five star rank on all songs in Expert mode.

Unlock U.S.A.:
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Get a five star rank on all songs in Easy mode.

Unlock Viking:
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Get a five star rank on all songs in Medium mode.