Play show time mode and score minimum gold for every song in each venue (easy mode). You will unlock the following cheat codes

Cheat collection 1:

Small head character: RIGHT, RIGHT, UP, UP, L2, L2, R2, R1, L1
Big eye Character: SQUARE, SQUARE, SQUARE, SQUARE, CIRCLE, DOWN, DOWN, R2, L2, R1
Banana Microphone: L1, L1, R2, R2, RIGHT, DOWN, CIRCLE, LEFT, UP, SQUARE
Toothbrush Microphone: R1, L1, R2, L2, RIGHT, LEFT, DOWN, UP, CIRCLE, SQAURE
Dwayne Doll Microphone: CIRCLE, R2, SQUARE, L1, R1, L2, SQUARE, UP, CIRCLE, SQUARE.


Cheat collection 2:

Big head characters: DOWN, DOWN, DOWN, UP, R1, L2, R2, L1, CIRCLE, CIRCLE
Glass Character: SQUARE, SQUARE, CIRCLE, R2, R2, L2, DOWN, RIGHT, RIGHT, UP
Oil Slick Character: L2, R2, L2, R2, SQUARE, DOWN, CIRCLE, UP, LEFT, RIGHT
Mercury Character: CIRCLE, L1, R2, UP, UP, LEFT, LEFT, SQUARE, SQUARE, R1
Wraith Character: R2, LEFT, R1, RIGHT, UP, UP, SQUARE, CIRCLE, DOWN, L2