Kant played central roles in the history of philosophy. Kantianism inspired the work of Schopenhauer and Nietzsche as well as German idealism defended by Fichte and Hegel. Marx and Engels developed communist theory in the second half of the 19th century while Heidegger and Gadamer pursued the tradition of German philosophy in the 20th century. A number of German intellectuals were also influential in sociology, most notably Adorno, Elias, Habermas, Horkheimer, Luhmann, Marcuse, Simmel, Tönnies, and Weber. The University of Berlin founded in 1810 by linguist and philosopher Wilhelm von Humboldt served as an influential model for a number of modern western universities. In the 21st century Germany has been an important country for the development of contemporary analytic philosophy in continental Europe, along with France, Austria, Switzerland and the Scandinavian countries. Music In the field of music, Germany claims some of the most renowned classical composers of the world, including Bach and Beethoven, who marked the transition between the Classical and Romantic eras in Western classical music. Also, Germans developed many Lutheran chorales and hymns. Other composers of the Austro-German tradition who achieved international fame include Wolfgang Amadeus Mozart, Brahms, Wagner, Haydn, Schubert, Händel, Schumann, Mendelssohn Bartholdy, Johann Strauss II, Bruckner, Mahler, Telemann, Richard Strauss, Schoenberg, Orff, and most recently, Henze, Lachenmann, and Stockhausen. Germany is the largest music market in Europe, and third largest in the world. It has exerted a strong influence on rock and heavy metal music. Artists such as Herbert Grönemeyer, Scorpions, Blind Guardian, Rammstein, Nena, Xavier Naidoo, Tokio Hotel and Modern Talking have enjoyed international fame. German musicians have contributed heavily to developments in electronic music. Synth-pop, electronic body music, trance, hardcore.Krautrock band Kraftwerk, are considered to be the pioneers of synth-pop, electro, techno, and house music. Tangerine Dream's "Love on a Real Train" was a major influence on the development of synthwave. German popular music of the 20th and 21st centuries includes the movements of Neue Deutsche Welle (Nena, Alphaville), Ostrock (City, Keimzeit), Metal/Rock, Punk (Nina Hagen, Böhse Onkelz, Die Ärzte, Die Toten Hosen), Pop rock (Beatsteaks), Indie (Tocotronic, Blumfeld) and Hip Hop (Die Fantastischen Vier, Deichkind). A global trendsetter is the German Minimal and Techno scene (e.g. Ricardo Villalobos, Paul Kalkbrenner and Sven Vath). Germany hosts many large rock music festivals every year. The Rock am Ring festival is the largest music festival in Germany, and among the largest in the world.