For ones of the past, I would've loved to have seen Elvis and the Beatles.

Right now, I really wish I could see Big Bad Voodoo Daddy live on a concert tour. ( BBVD web site ) They're an incredible big band/swing type band that I just love. They're not even going to be in Texas for the rest of this year, however! I don't know if I'd actually go see them; I guess I'm somewhat like you, Zia, where I think about how it'd be nice to go, then I forget about it. Money also would be an issue, depending on ticket prices, I suppose.