Related Clues:

• Operatic stars
• High-note hitters
• Demanding, egotistical types
• The Three ___
• Choir members
• Some opera headliners
• 45-Down performers
• Caruso and Carreras
• Beverly Sills and others
• Some barbershop quartet members
• Sills/Sutherland
• High-toned fellows?
• Some male singers
• Courses of thought
• Pavarotti et al.