Related Clues:

• Musical composition
• See 54-Across
• See 58-Across
• Musical work
• The women in 'Little Women,' e.g.
• Chamber group
• The Beatles, e.g.
• Barbershop group?
• Cat's paws, e.g.
• Quartet
• Monopoly's railroads, e.g.
• Many a pop group
• The classical elements, e.g.
• Any foursome
• Four-note chord