Related Clues:

• ZZ Top, musically
• Lounge group, sometimes
• Last movement of a sonata
• Sonata segment
• Duo plus one
• Last movement of a sonata, often
• Destiny's Child, for example
• Sonata finale, often
• Small singing group
• Part of a sonata
• Certain singing ensemble
• The Stooges, for one
• Not quite a quartet
• Charlie's Angels, e.g.
• The Chipmunks, e.g.