Related Clues:

• The Stooges, for one
• Not quite a quartet
• Charlie's Angels, e.g.
• The Chipmunks, e.g.
• Matched set
• Mother Goose's mice, e.g.
• Old King Cole's fiddlers, e.g.
• Dixie Chicks, e.g.
• Small jazz group, e.g.
• Singer plus two, e.g.
• Quartet with one out sick
• OutKast, e.g.
• Quartet, after a defection
• Many a jazz combo
• Beethoven's "The Ghost," e.g.