Janet Jackson
Shania Twain
Backstreet Boys (only twice *sigh*)
NSYNC (once
...urgh???)
John Mayer (2xs)
Ricky Martin (yeah...okay I went)
Usher
Big and Rich (only once *sigh*)
Jessica Simpson (when she went on her 1st tour)
Youngstown (They were sooo good)
I'm going to the Scream IV tour, with Pretty Ricky, Bow Wow, Omarion, Bobby Valentino, I'm sooo excited, missed DC3 though on their final tour.
I'm sure there are more, if you count all my singing performances then there are TONS... lol