Good duet songs for female and male?

I have a huge talent show coming up, and I'm singing with my friend. He and I don't know what song to do yet. We're aiming for closing, so we want something perfect for that. Epic. (: So far, we have broken strings by james morrison and nelly furtado, and written in the stars by elton john. Does anybody have any ideas? Preferably not from a musical. Movies are fine! Thanks! (: