Related Clues:

• Rock's Cream or ZZ Top
• Old King Cole's fiddlers, collectively
• Beethoven's "Pathetique" is one
• The Bee Gees, for much of their career
• Many a chamber piece
• Sextet half
• Group showing a bit of patriotism
• Rock music's Rush, e.g
• Small group turn it on at regular intervals
• Sat in on a piece of music
• "The Three Tenors," obviously
• Huey, Dewey and Louie, e.g
• Not even 1 + 10 = 3
• "Moonlight ___" (Beethoven masterwork)
• Piece of music for piano