FEMALE:
CHARICE
Demi Lovato
Mariah Carey
Carrie Underwood
Carly Smithson
Siobhan Magnus
Kelly Clarkson
Hayley Williams
Amy Lee
MALE:
Tyson Ritter (from All American Rejects)
David Cook
The lead singer from Aerosmith
Arnel Pineda (of the band Journey)
John Veseley (Secondhand Serenade)
Adam Levine
Shayne Ward