If I had to be serious, I think I'd like music that was beautiful and optimistic, uplifting and forward looking. I'd start with Michael Nyman's Piano, I'd have an opera duet like The Flower Duet (and I don't care if it's hackneyed, it's still good) with soaring, joyful voices and, if I can't have Disco Inferno or Springteen's I'm on fire, I think Lark Ascending would be where I'd end up, fading to the memory of a new spring.