I can easily choose two, dropping to just one would be hell because they're my faves from Nana Mizuki. Third isn't a problem either, could find a fourth too if she can sing four. Nope, not getting greedy here, just excited and asjsadjajnsja, it will do great things to the girl too.

Anyway, max limit of four sounds good, I think it's pretty normal in concerts like these. ...Well, except it's 2 on most TV shows and more than four on festivals.

As long as it's not just one, I'm good to go with whatever, so we'll see about it later! I'm probably going to ask about this later too, once we know more about how many are going to show up, so be prepared! XD