You're talking about the new Guitar Hero right? I played it at Aki-con for like an hour. Sometimes the scroll thingy did seem a bit weird, the notes seemed like they didn't attach to the fret board thingy. I'll post more about this in the Guitar Hero post.
But back on topic, I won the Rock band tourny at Aki-con, the rules for this particular tourny was very...uh unique. So first of all, you could sign up as a band or individually, or in my case, both. That's the first unique part because normally for Rock Band you have people sign up as a band, with no singles. So this meant, Two bands, me in one, and and 3 singles, me also included. (oh, I asked if it was ok for someone to be in a band and to be by themselves and they said it was find and that's why I did that.) There was only 5 uh "groups" and they used the double elimination like in the GH3 tourny, only because of how few participated. oh another thing, if you were in a band each member had to be on the same difficulty and also whatever difficulty was picked by the song chooser, that's the difficulty the next person had to play on. They went by percentage, which actually worked out because it's kinda hard for a band on all expert to get and average percent as good as someone on expert bass. You could choose any instrument, you want to play this song on expert but you can only play the bass part, play it then the next person gets to play that song on expert with any instrument they want. I think that's basically it, it was very unique, to say the least, but surprisingly, it was a lot of fun.
Wow that's a lot of words I hope I explained it ok.