No, you don't HAVE to. You can use only the guitar, or only the drums, or all of them.
No you dont need a microphone to play rock band. But if you like to sing you can buy the microphone i know i like to sing.
No, you don't need any microphone. If you plan on singing without the microphone you will need to have an Xbox Live 360 Headset.
Yes you can, in fact you can use three microphones and you can sing harmonies together on most of the songs just like The Beatles did in real life.
Play the guitar
no
no. but you need a guitar, or microphone and controller to play
No, net necessarily. You do need a Wii microphone
Yup :)
You only need 1. It is for the microphone.
Yes, but you need a microphone or a drum set.
You can use your Xbox360 Wireless headset to play!
No I tried it does not work at all
yes
yes because they both run off of usb ports
No a controller is not a Microphone and can not be one
you can with mic and guitar, but not drums
As long as it is USB, any microphone should work with Rock Band. In fact, the Xbox Live headset even works as a microphone for this game.