I don't really know, but I am pretty sure that you need the whole package (drums, mic, the whole shabang!).
You can't play rock band on the wii, using the Wii remote as a guitar.
You need a PS2 to Wii/Gamecube Controller Adapter and a PSone DualShock. Then, you need to plug in the PS2 to Wii/Gamecube Controller Adapter into controller slot 1, and hold Left on the D-Pad of the PSone DualShock while plugging it into the Controller Adapter.
Then, the PSone DualShock goes into Guitar mode, and you can use R2 for Green, Circle for Red, Triangle for Yellow, X for Blue, and Square for Orange, on the PSone DualShock.
I don't think holding Left on the Wii remote while turning on the Wii remote will make it be detected as a guitar. I haven't tried that so I don't know.
no unless you hack it to play the notes. You can look but you won't find much on how to do it
No you need a mic accessory for rock band.
yes
Yes
at least one! if you want to play all the instruments at the same time, use the number of wii remotes to instruments
no
You only need 1. It is for the microphone.
u dont half 2 buy all of them but the # that the wii remotes go up 2 is 4.
Yes most achievements are single player
nothing
You can play Band Hero Drum with Rock Band 2, not rock band 1 ( you have to transfer the songs from RB1 to RB2 to play with Band Hero Drums)
Yes, a Guitar Hero World Tour guitar should be able to work with Green Day Rock Band on any system.
You can play band hero instruments with rock band 2.
Yes there will be a Green Day Rock Band. On the Spike VGA's Green Day anounced the game.
There is no Rock Band 4.
You can play Rock band with a guitar hero guitar, but you can't play Guitar Hero with a Rock Band guitar.