Related Clues:

• Foam
• 'Otello,' e.g.
• See 17-Across
• Musical composition
• 'Don Giovanni,' for one
• Kind of hat or house
• Grammy category
• Collected works
• 'La Bohème,' e.g.
• Field of buffos
• Head
• Aria area
• Beer, slangily
• Paris landmark, with 'L''
• Musical works