junge Siegfried (Young Siegfried), which explored the hero's background. He completed the text of the cycle by writing the libretti for Die Walküre (The Valkyrie) and Das Rheingold (The Rhine Gold) and revising the other libretti to agree with his new concept, completing them in 1852. The concept of opera expressed in "Opera and Drama" and in other essays effectively renounced the operas he had previously written, up to and including Lohengrin. Partly in an attempt to explain his change of views, Wagner published in 1851 the autobiographical "A Communication to My Friends". This contained his first public announcement of what was to become the Ring cycle: I shall never write an Opera more. As I have no wish to invent an arbitrary title for my works, I will call them Dramas ... I propose to produce my myth in three complete dramas, preceded by a lengthy Prelude (Vorspiel). ... At a specially-appointed Festival, I propose, some future time, to produce those three Dramas with their Prelude, in the course of three days and a fore-evening [emphasis in original]. Wagner began composing the music for Das Rheingold between November 1853 and September 1854, following it immediately with Die Walküre (written between June 1854 and March 1856). He began work on the third Ring opera, which he now called simply Siegfried, probably in September 1856, but by June 1857 he had completed only the first two acts. He decided to put the work aside to concentrate on a new idea: Tristan und Isolde, based on the Arthurian love story Tristan and Iseult. One source of inspiration for Tristan und Isolde was the philosophy of Arthur Schopenhauer, notably his The World as Will and Representation, to which Wagner had been introduced in 1854 by his poet friend Georg Herwegh. Wagner later called this the most important event of his life. His personal circumstances certainly made him an easy convert to what he understood to be Schopenhauer's philosophy, a deeply pessimistic view of the human condition. He remained an adherent of Schopenhauer for the rest of his life. One of Schopenhauer's doctrines was that music held a supreme role in the arts as a direct expression of the world's essence, namely, blind, impulsive will. This doctrine contradicted Wagner's view, expressed in "Opera and Drama", that the music in opera had to be subservient to the drama. Wagner scholars have argued that Schopenhauer's influence