Secret Rainbow Background
To make a rainbow appear in the background, first pick the Music Mountain level.
While playing, jump up/spin throughout the song. You should have a bird land on your character's head. With the song completed, change your instrument to a different part and repeat the jump/spin. Do this will all the parts so that by the end, everyone has a bird on their head!
The beautiful rainbow will then materialize in the background.
More tricks, tips and cheats for this game are right here - Wii Music cheats
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