 In his biography of Kingsley Amis, Richard Bradford devotes a chapter to "The Alteration", its origins and context within the author's life.In 1973, Amis had heard a reproduction of the voice of Alessandro Moreschi, the last known European castrato.Amis disagreed with the proposition that Moreschi's performance could be considered "great art", because Moreschi had been castrated, and "true" art centred on the celebration of human sexuality.