Related Clues:

• Male voice range
• Some harmonizers
• Cheery syllables
• Carlo Bergonzi, e.g.
• Faust, e.g.
• High male voice
• Cheery refrain
• Pavarotti, for one
• Some female singers
• Some choirboys
• Voice above a baritone
• Don Jose, in ''Carmen''
• Merry refrain
• Airy refrain
• Nonsense syllables of song