Possible Clues:

• Couple owing the last bit of debt
• Outstanding tango presented by smallest group?
• Two-person performance
• Piece for two players
• 'Islands in the Stream,' e.g
• 1976's 'Don't Go Breaking My Heart' or 2018's 'Shallow'
• Number for a pair?
• Split-screen TikTok video
• Performance with two singers
• Irving Berlin's 'Anything You Can Do (I Can Do Better),' for one