Related Clues:

• Puccini's 'O Mimi, tu più non torni' e.g.
• "I Got You Babe," e.g.
• "Cinque, dieci, venti, trenta" in "The Marriage of Figaro," e.g.
• Tune for four hands
• Piece for a pair
• Musical piece by two performers
• A song sung by two
• Piece marked "one piano, four hands"
• Indigo Girls song, e.g
• Piece played by a pair
• Musical piece for two
• Work that can't be done alone
• Tune two croon
• An act of duplicity?
• Musical piece for two performers