Related Clues:

• ''Faust,'' for one
• 'Otello', e.g.
• Glass work
• Battle of nations
• Phantom's domain
• ''Fidelio'' was Beethoven's only one
• Sphere of Mars
• Where glasses may be raised?
• Comic work, perhaps
• 'Carmen', e.g.
• ''Carmen'' or ''Tosca''
• ''Ernani,'' e.g.
• "This means ---!"
• ''Fidelio,'' for one
• ''Faust'' or ''Don Giovanni''