consol game idea

We had a small party last night and somehow all got around to playing guitar hero and dance dance revolution on our xbox360.  It was a lot of fun and I got to thinking that a great idea for a game would involve both. 

Why not make a game that had the guitar, and dance pad at the same time.  Throw in some karaoke and maybe some of those motion sensitive drum sticks? Make it really fun for a whole group to play at the same time.  All the equipment already exists I believe.  It would add a whole new level to the 'family band' idea.  Note: Dad, if your reading this tell your clients!