Lets try to add songs..
Britney - Shattered Glass [well, she needs to go for the fifth single and since it's the VMA we need something up tempo]
Kelly Clarkson - Already Gone
Kelly Rowland - Love Takes Over
Keri - Start with Slow Dance [ which will be the currnet single on the way on peaking] and in the middle switch to How Does It Feel [hopefully next single and same reason with Britney's SG]
Pink - Funhouse
Ciara - Puker Up / Work [one of them needs to be the US single and again, up temp]
Shakira - She Wolf
Jordin - S.O.S (Let The Music Play)
BEP - Meet Me Halfway [Not sure if it's the best song for a performance but BBP is too old and I'm not a fan of IGAF...and it will be old by than]
Mariah - Obsessed
.
Beyonce - Sweet Dreams/Ego [??](she better not ***** Halo if she really end up performing]
Lady GaGa - New single from The Fame : Monster
or Starstuck which HAS to be the next single if it's not a new song!
Rihanna - new song if is ready till than.
Daughtry - September [or w/e new single is]
A Cascada performance won't hurt as well, same for The Fallen with Bury Me Alive and Linkin Park New Divide.
You can add who ever I forgot/didn't like so didn't put on [XD]