Possible Clues:

• Pair proudly taken up to centre
• Sonny and Cher, e.g
• Couple in love, not half tongue-tied at first?
• Hall and Oates, e.g
• Work for two
• What's to do about you for the pair of performers?
• The Smothers Brothers, e.g
• Deuce
• Two musicians have rejected Arab's lute
• Two-piano piece