Franz Liszt (22 October 1811 – 31 July 1886) was a Hungarian composer, pianist and teacher of the Romantic period. With a diverse body of work spanning more than six decades, he is considered to be one of the most prolific and influential composers of his era and remains one of the most popular composers in modern concert piano repertoire. Liszt first gained renown during the early nineteenth century for his virtuoso skill as a pianist. Regarded as one of the greatest pianists of all time, he toured Europe during the 1830s and 1840s, often playing for charity. He was a friend, musical promoter and benefactor to many composers of his time, including Frédéric Chopin, Charles-Valentin Alkan, Richard Wagner, Hector Berlioz, Robert Schumann, Clara Schumann, Camille Saint-Saëns, Edvard Grieg, Ole Bull, Joachim Raff, Mikhail Glinka, and Alexander Borodin. Liszt was one of the most prominent representatives of the New German School (German: Neudeutsche Schule). He left behind an extensive and diverse body of work that influenced his forward-looking contemporaries and anticipated 20th-century ideas and trends. Among Liszt's musical contributions were the symphonic poem, developing thematic transformation as part of his experiments in musical form, and radical innovations in harmony. Liszt has also been regarded as a forefather of Impressionism in music, with his Années de pèlerinage, often regarded as his masterwork, featuring many impressionistic qualities. In a radical departure from his earlier compositional styles, many of Liszt’s later works also feature experiments in atonality, foreshadowing the serialist movement of the 20th century.