Friedrich Nietzsche s text Five prefaces to five not-written books (concluded in December 1872) can be read as a document attesting a reserve that would grow stronger between the philosopher Friedrich Nietzsche and the composer Richard Wagner. That reserve would culminate in the subsequent rupture with the close relationship that both of them had cultivated at the time of the composition of Nietzsche s first book, The Birth of Tragedy (concluded in December 1871). The interest of the Five prefaces to five not-written books consists on the fact that, although being considered as belonging to the initial phase of Nietzsche s production, this text already gives signs of many themes that Nietzsche would develop in his search of his own phil...