Related Clues:

• Indigo Girls song, e.g
• Piece played by a pair
• CD track
• What you might break into
• Spiritual, for example
• Musical piece for two
• Grammy nominee, maybe
• 'Row, Row, Row Your Boat,' e.g
• Single, say
• Work that can't be done alone
• It may be broken into on Broadway
• Tune two croon
• See 15
• See 9
• See 17