Related Clues:

• Grace Bumbry's solo
• Part of a score, maybe
• Domingo piece
• 63-Across, e.g.
• 41-Down highlight
• Opera showstopper
• What the fat lady sings
• Diva's moment
• ''Un bel di,'' for one
• ''Toreador Song,'' e.g.
• Berg's 'Der Wein,' e.g.
• Part of a libretto
• An air from ''Aida''
• Pons song
• Operatic song