Related Clues:

• Palo __
• Countertenors
• Melchior, for one
• Orfeo, e.g., in Gluck's 'Orfeo ed Euridice'
• Caruso, notably
• Voice above a tenor
• Part of SATB
• She's low
• Low voices
• The voices of Oberon, Rinaldo and Erda
• Female choir members
• Chorus voices
• Word on a Mexican stop sign
• Hymn part
• "Nessun dorma" singer