Like Rock Band, but with a different title.
Seriously, a different drum kit, and a possibly new guitar controller aren't cutting it for me. I've never been big on "Create Your Own XXXXXX" interfaces apart from the character ones. That's only (barely) acceptable because I like seeing myself, as it were, in games.
Plus, my room already has three guitars, the drum kit, the microphone, my real microphone, the normal controllers, my games, my TV etc. etc. in it. I'm running out of space here! I need to SLEEP in my room too ya know! Not to mention forking out at least $150 for the blasted things all over again. Sod you people, I'm out of this.
I'll most likely be eating my words if they ever make a "Piano Hero/Villain/Whatever" game. I love rock songs with a piano in them. I think it adds real depth to the sound. That's why I play it in my band.