Related Clues:

• Some male singers
• Courses of thought
• Pavarotti et al.
• Choir section ... and what are missing from the starred clues
• Roy Orbison and Marvin Gaye, e.g.
• Some singing villains
• Some of the knights in Wagner's 'Tannhäuser'
• Pavarotti and Domingo, e.g.
• Singers above baritones
• Low men at La Scala
• Deep opera voices
• Domingo and others
• Choir males
• Domingo et al.
• Deep singers