Spot the difference
In the May 2022 issue of Opera Now, your correspondent Fiona Hook makes the mistake of equating the historic castrato alto with a contemporary countertenor alto (The Golden Age of the Countertenor, page 22). Not all male altos are the same. The castrato and countertenor voices depend on radically different means of vocal production. The countertenor, alto or soprano, uses only a portion of his vocal cords and stays primarily in his head voice.
The castrati, on the other hand, developed strong vocal muscles, used all of their vocal cords, and cultivated their chest voices.
As I argued in my article in Early Music America Magazine (EMAg, January 2021), the closest approximation of the castrato voice is not a countertenor but a female mezzo or contralto.
Countertenor…