All through middle and high school, with several awards including UIL Best Actress. Theatre minor in college, part of the Gilbert and Sullivan Society in El Paso (played Yum Yum in The Mikado, one of my favorites). Ask if someone's in theatre and they'll give you their credentials. Currently unable to be onstage, as I have no transportation, but I AM in a great celtic folk band, so I still get to perform from time to time. I miss acting, though.

I would say, pick a song from a loved musical. It shows that you know the stuff, and would be sung in the style they want anyway.