Related Clues:

• Jose Carreras, for one
• See 1-Across
• Domingo, for one
• Pervading tone
• See 17-Across
• Don Jose, in 'Carmen'
• Quarter of a quartet, maybe
• Violist's clef
• Countertenor
• Doo-wop part
• Chorus voice
• Voice above baritone
• Kind of horn
• See 24-Down
• Kind of sax