title: Castrati choir and opera singers.
mesh_terms: D002369:Castration / Q000266:history*; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008297:Male; D009146:Music / Q000266:history*; D012068:Religion and Medicine; D014551:Urinary Tract; D014831:Voice