The voice of the castrato.
Jenkins
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D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D007558:Italy; D008297:Male; D009919:Orchiectomy / Q000266:history* / Q000379:methods; D014833:Voice Quality