What country/pop songs are good for a talent show?

I am doing a talent show and I love country and pop music and don't know what song to sing. I like Taylor Swift, Rascal Flatts, Miley Cyrus, Demi Lovato, Pink,Ashley Tisdale, Coeur De Pirate, Colbie Callait, The Fray, Kelly Clarkson and Leona Lewis. Please give me some ideas, I was thinking of doing Comme Des Enfants by Coeur De Pirate but I'm not so sure.... Thanks in advance