Related Clues:

• ''Fidelio,'' e.g.
• ''Carmen'' or ''Norma''
• Type of glasses
• Dean Martin song topic
• Phantom's haunt
• ''Il Trovatore,'' for one
• 'Fidelio,' for one
• '... to form -- perfect Union ...'
• Word with soap or horse
• Met piece
• La Scala show
• 'Moonstruck' subject
• Phantom's place
• Sometimes it's grand
• Verdi product