Andrenelli naturally did not have voice break, due to genetics, delayed puberty or hormonal imbalance/lack of testosterone. it means its a natural voice of a castrato, not that he had an orcheotomy when he was a pre teen. thats why its called natural. its also called " Castrato tenor " as a teacher said. meaning... by castrato = no voice break or high voice naturally in mezzosoprano, or similar. and by tenor, meaning " he still has his balls ". I know its not natural to not have a voice break in puberty, but with natural it is meant, that there was no PHISICAL castration, but rather just lack of testosterone. Andrenelli could be also called "male" soprano, or natural "countertenor" ,but countertenor is now a days used by 90 % of normal adult voices with use of falsetto, and male soprano sometimes also its just falsetto. lets say 50 % of the male sopranos, are natural countertenors or natural castrati. The others are extreme high falsettists, probably posess a bass voice also, its common for a bass to have a super high falsetto. Thats why I dont call myself " countertenor " and not even "male soprano "