For the most part don't worry about the sign up sheet as far as being limiting, we can always add another player if there is something you want to play on.
We really just use that as a guide to keep things running smoothly and so people know what songs we are probably going to play so that they can be ready if there is a song they really like.
You can add songs too if you want.
I'm signed up for 7 or 8 songs, but personally I enjoy the guitar displays and hanging out with other forumites the most
