Today's Piano Puzzler

This week's contestant is Sean Hampton from Round Rock, Texas.  This sounds like a repeat from their archives, not just because the bantering about Round Rock, but there's a passage in the arrangement that sounded familiar.  Whether I got the hidden song from that -- or because I did recognize it, I don't know.  It's well-hidden, but identifiable, I thought,  Though the contestant had trouble.  I also guessed the composer, and that had nothng to do with remembering it from before.