Guitar Hero World Tour Cheats

Go to options then to cheats on the options menu then go to new cheat

All characters must be bought from the character select screen after completing the unlocking requirements.

Performance Mode:
Press Yellow, Yellow, Blue, Red, Blue, Green, Red, Red.

Hyperspeed:
Press Green, Blue, Red, Yellow, Yellow, Red, Green, Green.

Auto Kick:
Press Yellow, Green, Red, Blue, Blue, Blue, Blue, Red.

Unlock Quickplay:
Press Blue, Blue, Red, Green, Green, Blue, Blue, Yellow.

Aaron:
Press Blue, Red, Yellow, Yellow, Yellow, Yellow, Yellow, Green.

Nick:
Press Green, Red, Blue, Green, Red, Blue, Blue, Green.

Johnny Viper:
Press Blue, Red, Blue, Blue, Yellow, Yellow, Yellow, Green.

Rina:
Press Blue, Red, Green, Green, Yellow, Yellow, Yellow, Green.

Air Instruments:
Press Red, Red, Blue, Yellow, Green, Green, Green, Yellow.

Invisible Characters:
Press Green, Red, Yellow, Yellow, Yellow, Blue, Blue, Green.

AT&T Ballpark:
Press Yellow, Green, Red, Red, Green, Blue, Red, Yellow.

Gem Color:
Press Blue, Red, Red, Green, Red, Green, Red, Yellow.

Flame Color:
Press Green, Red, Green, Blue, Red, Red, Yellow, Blue.

Star Color:
Press Red, Red, Yellow, Red, Blue, Red, Red, Blue.

Vocal Fireball:
Press Red, Green, Green, Yellow, Blue, Green, Yellow, Green.

Always Slide:
Press Green, Green, Red, Red, Yellow, Red, Yellow, Blue.

Extra Line 6 Tones:
Press Green, Red, Yellow, Blue, Red, Yellow, Blue, Green.

To unlock TTFAF you normally have to beat career mode - but here's a cheat.
PS Sorry if it doesn't work because I haven't tried it yet...
Y = Yellow
G = Green
B = Blue
R = Red
O = Orange