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What is a good song for a guy playing piano and a soprano female to sing?

My friend and I want to sing a song for Coffee House, a cabaret/talent show event. I am not the best of singers, but I do love to sing duets with my friend, who is an excellent soprano singer. I have exceptional piano skills, and just about any song can be in our repertoire. Other students have done many musical selections like Wicked and Phantom of the Opera, so we want to stay away from those. Does anyone have any suggestions? Any and ALL will be highly and greatly appreciated.

How about a traditional one, like "She Walks in Beauty" by Sissel? That would sound amazing.