As the castrato's body grew, his lack of testosterone meant that his epiphyses (bone-joints) did not harden in the normal manner. Thus the limb of the castrati often grew unusually long, as did the bones of their ribs. This, combined with intensive training, gave them unrivalled lung-power and breath capacity. Operating through small, child-sized vocal cords, their voices were also extraordinarily flexible, and quite different from the equivalent adult female voice, as well as higher vocal ranges of the uncastrated adult male (see soprano, mezzo-soprano, alto, sopranist, countertenor and contralto). Listening to the only surviving recordings of a castrato (see below), one can hear that the lower part of the voice sounds like a "super-high" tenor, with a more falsetto-like upper register above that.
The phrase Soprano maschio (male soprano), which could also mean falsettist, occurs in the Due Dialoghi della Musica of Luigi Dentini, an Oratorian priest, published in Rome in 1553. On 9 November 1555 Cardinal Ippolito II d'Este (famed as the builder of the Villa d'Este at Tivoli), wrote to Guglielmo Gonzaga, Duke of Mantua (1538-1587), that he has heard that His Grace is interested in his cantoretti , and offering to send him two, so that he could choose one for his own service. This is a rare term, but probably does equate to castrato . Sherr The Cardinal's brother, Alfonso II d'Este, Duke of Ferrara, was another early enthusiast, enquiring about castrati in 1556.
In 1878, Pope Leo XIII prohibited the hiring of new castrati by the church: only in the Sistine Chapel and in other papal basilicas in Rome did a few castrati linger. A group photo of the Sistine Choir taken in 1898 shows that by then only six remained (plus the Direttore Perpetuo , the fine soprano castrato Domenico Mustaf), and in 1902 a ruling was extracted from Pope Leo that no further castrati should be admitted. The official end to the castrati came on St. Cecilia's Day, 22 November 1903, when the new pope, Pius X, issued his motu proprio , Tra le Sollecitudini ('Amongst the Cares'), which contained this instruction: "Whenever . . . it is desirable to employ the high voices of sopranos and contraltos, these parts must be taken by boys, according to the most ancient usage of the Church." The last Sistine castrato to survive was Alessandro Moreschi, the only castrato to have made solo recordings. While an interesting historical record, these give us only a glimpse of the castrato voice - though he had been renowned as "The Angel of Rome" at the beginning of his career, some would say he was past his prime when the recordings were made in 1902 and 1904. Clapton, N.: Alessandro Moreschi and the World of the Castrato (London, 2008), p197-216 He retired officially in March 1913, and died in 1922.
Source: Wikipedia > Castrato
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