Related Clues:

• Backup singers, often
• Blink-182, e.g.
• The Stooges, for instance
• Subordinate division of a minuet
• Troika
• Chamber group
• Chamber piece
• Combo size, sometimes
• Set of three
• Bass, piano and sax, e.g.
• Kingston bunch
• The Beatles, e.g.
• Haydn string composition
• Fates, for one
• Half a sextet