Wii Music
Choose the Quick Jam or Custom Jam mode, then enter any of the listed
codes at the “Start Playing?” screen to start a Jam Session with all
the Miis in corresponding costume.
Wii Music T-shirts: Hold Right and press Start.
Tuxedos: Hold Up and press Start.
Rapper costumes: Hold B + Up and press Start.
Dog costumes: Hold Down and press Start.
DJ/beat boxer costumes: Hold B + Right and press Start.
Cheerleader costumes: Hold B + Left and press Start.
Cat costumes: Hold Left and press Start.
Black Belt costumes: Hold B + Down and press Start.