During the early 19th century a number of composers began to write in new genres inspired by literature: Chopin's Ballades, Schumann's Novelletten and, later, Liszt's symphonic poems are all examples of this Romantic urge to create works that transcend the divide between the arts. In 1828 Felix Mendelssohn invented a genre of his own, when he presented his sister Fanny with a 'song without words' for her birthday. He went on to compose a large number of such Lieder ohne Worte and published no less than six sets of six pieces each. These became immensely popular with amateur and professional pianists, as well as with their respective audiences. Mendelssohn's death in 1847 did not affect the huge demand for the pieces, and the publisher Simrock soon issued another two sets, compiled from pieces that the composer had set aside for later publication.