Related Clues:

• 63-Across, e.g.
• ''Billy Budd'' for one
• 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.
• Word with horse or soap
• Part of a libretto
• An air from ''Aida''
• ''Norma'' or ''Tosca''
• Pons song
• Met production