Rock Band 1 (Wii): Guitar controller + USB microphone.
Rock Band 2 (Wii): Guitar + Mic + Drum kit (4 pads + pedal).
Rock Band 3 (Wii): Guitar + Mic only. Drums/Keyboard sold separately.
Note: Wii RB3 does not support Keyboard or Pro instruments (unlike PS3/360). All instruments connect via USB dongles. Check bundle contents before buying used.