Here is a list
# Cheat mode
At the main menu, quickly press Blue, Yellow, Orange, Red, Orange, Yellow, Red, Yellow, Red, Yellow, Red, Yellow, Red, Yellow, Red, Yellow to unlock all guitars, songs, videos, and cheats. Saving the game will be disabled, and you must turn off the PlayStation 2 to disable its effect. In the PAL version, press Blue, Yellow, Orange(2), Yellow, Blue, Yellow, Blue, Yellow, Blue, Yellow, Blue, Yellow, Blue, Yellow at the main menu.
# Guitarist uses Air Guitar
At the main menu, quickly press Yellow(2), Blue, Orange, Yellow, Blue. If you entered the code correctly, a message will appear. Repeat this code to disable its effect. In the PAL version, quickly press Blue, Yellow, Orange, Blue, Yellow(2) at the main menu.
# Guitarist has flaming head
At the main menu, quickly press Orange, Yellow, Orange(2), Yellow, Orange, Yellow(2). If you entered the code correctly, a message will appear. Repeat this code to disable its effect. In the PAL version, quickly press Yellow(2), Orange, Yellow, Orange(2), Yellow, Orange at the main menu.
# Guitarist has horse head
At the main menu, quickly press Blue, Orange(2), Blue, Orange(2), Blue, Orange(2), Blue. If you entered the code correctly, a message will appear. Repeat this code to disable its effect. In the PAL version, quickly press Orange(2), Blue, Orange(2), Blue, Orange(2), Blue, Orange at the main menu.
# Audience has eyeball heads
At the main menu, quickly press Blue, Orange, Yellow, Orange, Yellow, Orange, Blue. If you entered the code correctly, a message will appear. Repeat this code to disable its effect. In the PAL version, quickly press Yellow, Orange, Blue, Orange, Blue, Orange, Yellow at the main menu.
# Audience has monkey heads
At the main menu, quickly press Orange, Blue, Yellow(2), Orange, Blue, Yellow(2). If you entered the code correctly, a message will appear. Repeat this code to disable its effect. In the PAL version, quickly press Yellow(2), Blue, Orange, Yellow(2), Blue, Orange at the main menu.
# Hyper Speed mode
At the main menu, quickly press Orange, Blue, Orange, Yellow, Orange, Blue, Orange, Yellow. If you entered the code correctly, a message will appear. In this mode, the frets will move faster. Repeat this code to disable its effect. In the PAL version, quickly press Yellow, Orange, Blue, Orange, Yellow, Orange, Blue, Orange at the main menu.
# Performance mode
At the main menu, quickly press Yellow(2), Blue, Yellow(2), Orange, Yellow(2). If you entered the code correctly, a message will appear. In this mode, everything disappears except for the performance. Repeat this code to disable its effect. In the PAL version, quickly press Yellow(2), Orange, Yellow(2), Blue, Yellow(2) at the main menu.