Related Clues:

• The back of the choir?
• Choir voices
• Choir section
• Some 'Aïda' singers
• Some guitars
• Don Pasquale and others
• Chorus section
• Quarters of many quartets
• Operatic voices
• Operatic villains, often
• Lowest male voices
• Low-voiced singers
• Quarters of quartets
• They have low ranges
• Bad men of opera, usually