While playing Custom Jam on the rock drums, hold Nunchuk C + Wii-mote A and flail up and down as fast as possible. Also, try Nunchuk Z + Wii-mote B. Doing this will make a blast beat commonly used in thrash and death metal music.
Select Quick Jam or Custom Jam mode. At the "Start Playing?" screen, enter one of the following codes to start a Jam Session with all the Miis in the corresponding costume: • Black Belt: Hold Down + B and press Start. • Cat: Hold Left and press Start. • Cheerleader: Hold Left + B and press Start. • DJ/Beat Boxer: Hold Right + B and press Start. • Dog: Hold Down and press Start. • Rapper: Hold Up + B and press Start. • Tuxedo: Hold Up and press Start. • Wii Music T-shirt: Hold Right and press Start.