Can anyone shed some light on the tune Steve Martin uses in his Banjo Routine sketch. He starts with the mystery tune then comments: "Isn't that a happy sound - you just can't play a depressing song when you're playing the banjo". He later breaks into Foggy Mountain at lightning speed, but it's that first simple melody that I'm trying to crack - I've also heard it at the end of another of his sketches after an obligatory "excuuuuuuuse me!" Any clues?