Related Clues:

• ''Macbeth'' excerpt
• Solo by Sills
• ''Otello'' piece
• 'Aida' is one
• 45-across selection
• 'Fidelio' or 'Faust'
• "La Boheme," e.g.
• "La Boheme," for one
• Song for 63 Across
• Operatic number
• ''Messiah'' melody
• Big moment at La Scala
• "Elsa's Dream," for one
• Covent Garden number
• "Bess, You Is My Woman," e.g.