Katy Perry: "Roar"

Empowerment anthems have paid off for pop stars from Kelly Clarkson to Ke$ha in recent years, and Perry is sitting on a gold mine of emotional wreckage thanks to her swiftly imploded marriage to Russell Brand. Over pounding pianos, booming bass drums and Lumineers-style "hey!"s, she dances through the debris of her relationship and flexes diva vocals like pop's true savior.