The Lumberjack Song comes from Mozart's "Don Giovanni"

Listening to "Variations on "La Ci Darem La Mano" Op 2" by Chopin, which is a take on Là ci darem la mano, Don Giovanni's and Zerlina's duet in Act 1, Scene 2, of Wolfgang Amadeus Mozart's opera Don Giovanni..

Both have a riff very familiar to fans of Monty Python's The Lumberjack Song. : o )