Friedrich Nietzsche regarded himself as the most musical philosopher. Central to his life and his ideas was the music of Richard Wagner. This book explores Nietzsche's relationship with Wagner, the influence of his writings on the music of Strauss, Mahler, Delius, Scriabin, Busoni and others, his place in Thomas Mann's critique of German Romantic music in Doctor Faustus and his impact on 20th-century popular music.