http://www.rotten.com/library/sex/castration/eunuch/Dining peculiarities aside, most boys ushered into eunuchhood were made thus in order to become members of an exotic "third sex". In Italy the practice reached its pinnacle in the form of the "castrati", the young she-males who lent their angelic voices to the choirs and operas of the Catholic Church. Dolled up in their foppish clothes, with their rounded faces, and pale complexions, they were said to exude a profound sense of "otherness" -- to the delight of some and the horror of others. Their voices, raised in song, were unlike any other human voice. They sounded neither male nor female – nor even like that of a child. They were unique. They were“castrati”.
Although the musical ability of eunuchs had long been recognized in other cultures, and had no doubt been part of the Catholic music scene itself for quite some time, the Catholic Church did not officially acknowledge these boy “castrati” until 1599 when Pope Clement VIII became smitten with the sweetness and flexibility of their voices. Women were banned from singing in the Church, therefore it was the high vocal range of the castrati that gave devotional music its appealing angelic quality.
While some Church officials suggested it would be preferable to lift the ban on women singers than to continue endorsing the castration of little boys, the Pope disagreed, quoting Saint Paul, "Let women be silent in the assemblies, for it is not permitted to them to speak." Of course since it was illegal to perform castrations (transgressors could be excommunicated), all castrati presenting themselves for the choir claimed to have lost their genitals through tragic “accident”.
After the Pope’s official acknowledgement and acceptance of castrati, the number of these "accidents" increased dramatically. Parents seeking upward mobility towed their little lads down to a barber or butcher who separated them from their testicles for a fee. However, mere ball lopping did not a singer make. One still had to have a remarkable voice to qualify for the choir (and later, the operas). As a result, many boys found themselves needlessly lightened of their rightful loads. Still, few were left completely out in the cold. Since celibacy and pre-pubescent castration went hand in hand, many of these lads eventually found other places within the Church. As a result, all the churches in Italy soon had castrati staff.