Related Clues:

• Trio minus one
• Song for two
• Tune for two
• It may call for four hands
• Irving Berlin's 'You're Just in Love,' e.g.
• "Say, Say, Say" say
• The Everly Brothers, e.g.
• Everly Brothers performance
• Pair with an air
• Air for a pair
• It takes two
• One can't do this
• Air by a pair
• Pair's air
• Composition for two