The technique required to play Chopin's "Études", Op. 10 (1833) and Op. 25 (1837) was extremely novel at the time of their publication; the first performer who succeeded at mastering the pieces was the renowned virtuoso composer Franz Liszt (to whom Chopin dedicated the Op. 10). Liszt himself composed a number of études that were more extensive and even more complex than Chopin's. Among these, the most well-known is the collection "Études d'Execution Transcendante" (final version published in 1852). These did not retain the didactic aspect of Chopin's work, however, since the difficulty and the technique used varies within a given piece. Each of the études has a different character, designated by its name: Preludio; Molto Vivace; Paysage Mazeppa; Feux Follets [Irrlichter/ Will-o'-the-wisp; Vision; Eroica; Wilde Jagd Hunt; Ricordanza; Allegro Molto Agitato; Harmonies du Soir Harmonies; and Chasse-neige [Snow-whirls].