Original: Like "Tortues," this is also a musical joke - the thematic material is taken from Felix Mendelssohn's Incidental Music to A Midsummer Night's Dream and Hector Berlioz's Dance of the Sylphs.
Simplified: This is also a musical joke - the tune is taken from Felix Mendelssohn's Incidental Music to A Midsummer Night's Dream and Hector Berlioz's Dance of the Sylphs where it is played on high-sounding instruments.