Well the frogs in my locale must be more musically inclined. THey usually rev up the chorus all singing at the same pitch - a wavering Bb, more or less (yes I actually verified that on the piano one night - don't laugh!) Then a few tenors break out with the Gb below that Bb, and the night air resonates with the cheerful strains of a major third ... it's rather hypnotic, calms the soul, and only two notes are required! Eat your heart out, Amadeus!