Related Clues:

• Couples
• Braces
• Comedy teams, usually
• Some pop groups
• Small bands
• Pairs
• Harmonizing minimums
• Twosomes
• Chad & Jeremy and others
• Performing twosomes
• Some singing groups
• Two pairs?
• Rap music's Kris Kross and others
• Batman and Robin and Laurel and Hardy
• Pairings