Possible Clues:

• Tony, e.g.
• Singing range for castrati, often
• Work managed well without Norman, perhaps
• (Singer of) the highest vocal range
• Sort of protest rulers and numerous other leaders voice
• So soft, Nora sounds so high
• Consequently, publicity man sent round article describing singer
• Piece of music managed to be accepted by very good singer
• Upscale performer
• Callas, for one