Earlier this year on NPR's Performance Today, host Fred Child spoke with Rob Kapilow about the musical complexity of Sondheim's masterpiece in Stephen Sondheim's Clever 'Clowns'. The story includes a clip of Millicent Martin's rendition of the piece.
A brilliant take away from Rob's analysis:
Great song composers, whether it's Schubert or Sondheim, do not really set words to music. What they set is the emotion that's behind the words.