Related Clues:

• Beethoven's "Archduke," e.g.
• Merger of two quartets
• Three
• Rock's Green Day, e.g.
• Row of pawns, e.g.
• Kingston --
• Schubert's __ in F major
• The witches in 'Macbeth,' e.g.
• Schubert composition
• Mendelssohn wrote a notable one at age 16
• Group of winds
• Wooden shoe sailors, e.g.
• Andrews Sisters, e.g.
• Largish musical combo
• Rock's Green Day, for one