Related Clues:

• ''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
• Rossini work
• Gig for Domingo
• Phantom's locale
• Flagstad's field
• Juilliard major