Related Clues:

• Jazz club performer
• Quartet with a defection
• ''The Three Tenors,'' for example
• Chamber-music group
• Lounge group, perhaps
• Music group
• Men in a tub, e.g.
• Performance group
• Group of musicians
• Musical combo
• String ensemble
• Certain chamber group
• Crosby, Stills & Nash, e.g.
• Many a pop group
• ZZ Top, e.g.