Related Clues:

• Jose Carreras, for one
• See 1-Across
• Domingo, for one
• Pervading tone
• Striped critter
• One who sings the part of Boris Godunov
• ___ profundo
• Four-stringed instrument
• Don Jose, in 'Carmen'
• Quarter of a quartet, maybe
• Violist's clef
• Chorale part
• Countertenor
• Doo-wop part
• Chorus voice