I want a keyboard in GH/RB

I want a keyboard peripheral in Guitar Hero or Rock Band. It would be awesome. It could be a one-octave keyboard, and it would be immensely useful. You could play the keyboard on Rush songs, Dream Theater, The Who, whatever. Anyone else think it's a good idea?

I've been listening to a lot of Dream Theater lately, and it would be amazing to play Rudess's legendary keyboard on some songs. Obviously they would never include a song as long as this, but I'd love to play Octavarium in GH/RB. Play the cool synth intro, then the flute, then the wicked solo. All while singing. It would be realistic, too, because it's not just five buttons, it's an actual musical instrument.

Plus it's another piece of hardware for them to sell. Big money.

I also think a keyboard would be a good idea. While I do not at present own a PS2 or PS3, I am considering getting one becauseI like playing GH at my friends house. A keyboard for me if we got RB would let me playsongs from my favorite rock band, STYX (okay,I amdating myself here) I also like In A Gadda Da Vida by Iron Butterfly so a keyboard would be fun.