Could some one please suggest some upbeat pop numbers?

I have an audition coming up .it's something like american idol...I need a nice upbeat "POP" number .i generally do not do pop so i'm lost....Im a decent singer i do well with songs like those by amy lee and Natasha Bedingfield i suck at mariah carey songs and the like.....and this song that'll be singing for the audition has to be done without any music........so please please please help !!!!!!!