Related Clues:

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• 'Tosca,' e.g.
• What the fat lady sings?
• ''Fidelio'' for one
• It may be light or grand
• ''Fidelio'' is one
• Giacomo Puccini's work
• 'Nixon in China,' for one
• Massenet offering
• Kathleen Battle's bag
• Butterfly locale?
• Covent Garden event
• Musical show
• Beethoven wrote one
• "Faust," for one