This practice was begun in the 16th century and reached its peak in 17th and 18th century opera. The male heroic lead would often be written for a castrato singer (in the operas of Handel for example). When such operas are performed nowadays, a woman or countertenor takes these roles.
The only acknowledged castrato to make phonograph recordings was Alessandro Moreschi[?], the last surviving castrato of the Pope's choir. Moreschi recorded disc recordings for the Gramophone & Typewriter Company in 1902 and again in 1904. Critical opinion is divided about Moreschi's recordings; some say they are of little interest other than the novelty of preserving the voice of a castrato for Moreschi was a mediocre singer, while other critics detect the remains of a quite talented singer who was unfortunately past his prime by the time he recorded.
In more modern times, Ugo Farell has been suspected of being a castrato.
There have also been reported cases of so-called "natural castrati" who were born with hormonal disorders that reproduce the above "desired" effects of castration without the surgeon's knife.
Some uncastrated male singers are able to use their voices up into the soprano register, apparently without the use of the falsetto voice, and are known as sopranistas. There are very few such singers performing today. Sopranistas are also able to perform some music which was written for castrati, and composers such as Rossini wrote parts specifically for sopranista.
See also: eunuch