Related Clues:

• Opera cast members
• The back of the choir?
• Choir voices
• Choir section
• Lohengrin and others
• Some choristers
• Barbershop quartet members
• Some guitars
• Chorus section
• Pavarotti and Domingo
• Quarters of many quartets
• Some Met stars
• Choir singers
• Low-voiced singers
• Quarters of quartets