Possible Clues:

• Opera singer with a board-rattling voice
• Deep operatic voice
• Oriole initially on kind of perch is a singer
• Opera singer with a low voice
• Deep-voiced opera guy
• Opera villain's voice, often
• Opera troupe member
• Henry VIII in Donizetti's 'Anna Bolena,' e.g
• Opera voice
• Fish getting round in sound deep down