Possible Clues:

• Singing barber
• Mozart opera 'The Marriage of . . . . . .'
• The barber of Seville
• Barber of opera
• Mozart opera 'The Marriage of ......'
• Scheming operatic barber
• Operatic barber
• Barber-shop singer
• Opera character who sings 'Largo al factotum'
• Hero of Mozart opera