Related Clues:

• ''Fidelio'' was Beethoven's only one
• Where glasses may be raised?
• Comic work, perhaps
• 'Carmen', e.g.
• ''Carmen'' or ''Tosca''
• ''Ernani,'' e.g.
• ''Fidelio,'' for one
• ''Faust'' or ''Don Giovanni''
• Soap or horse follower
• Musical genre with its own glasses
• Type of hat or glasses
• 'Tha•s,' e.g.
• ''A Night at the ___''
• "Tosca," e.g.
• ''Einstein on the Beach,'' e.g.