Related Clues:

• The Three Stooges, e.g
• Song for three
• The Magi, e.g
• Anagram for "riot"
• Three with close harmony, e.g
• Three in key
• Singing group of three
• Chamber-music piece
• Alabama, but not Kansas?
• The Stooges were one
• The Supremes, e.g
• Yo La Tengo, for one
• Dumas' Musketeers, for one
• TLC, e.g
• Foursome minus one