Related Clues:

• Quartet with one out sick?
• Sam & Dave, e.g
• Pair plus one
• A pair of people
• Curly, Larry and Moe, e.g
• Folk music's Kingston __
• The Little Pigs, e.g
• Group of three singers
• Rosencrantz and Guildenstern, e.g
• The Jonas Brothers, e.g
• The Smothers Brothers, e.g
• The Musketeers, e.g
• Maroon 5, if two members were crushed by a piano (hey, a guy can dream)
• The Police, e.g
• Abbott and Costello, e.g