 Unfortunately, this treatise has been lost.Although there was a period in which many considered Liszt's works "flashy" or superficial, it is now held that many of Liszt's compositions such as "Nuages gris", "Les jeux d'eaux à la villa d'Este", etc., which contain parallel fifths, the whole-tone scale, parallel diminished and augmented triads, and unresolved dissonances, anticipated and influenced twentieth-century music like that of Debussy, Ravel and Béla Bartók.From 1827 onwards, Liszt gave lessons in composition and piano playing.