The topic of this thesis is the analysis of the Apres une lecture du Dante: Fantasia quasi Sonata, a very important piano work in the work of composer Franz Liszt. This widely known composition has left a big mark in the piano repertoire due to its technical complexity, but also due to the large range of emotions and dynamic shading that the work abounds in. The first chapter contains a review of the stylistic period of musical romanticism whose features the composition carries, a review of the composer's thinking, way of life and his worldview as well as the historical circumstances that took place during the creation of the sonata. An important item that will also be explained in more detail is the work or in another words - the textual template according to which the composition was created. The second chapter deals with the formal and harmonic analysis of the work or a series of musical motifs that are intertwined through the composition and their symbolism. Within the Dante sonata, Liszt wrote many interpretive marks that will be mentioned and explained as part of this chapter. Also, it is necessary to emphasize the importance of the interval of the increased quartet / reduced fifth (or the well-known name tritonus) through which Liszt outlines the symbol of hell and which appears throughout the work announcing the change and course of previous musical material. In addition, themes that appear throughout the work and oppose and contrast (divine vs. devilish) will be presented, and the way in which Liszt depicts certain feelings, emotions and characters through tonalities, rhythm and dynamics will be explained. The third chapter is based on the technical aspects of the composition and explains in more detail the approach to certain demanding places that the performer is facing. The types of techniques present in the composition will be described in more detail, as well as exercises that would help solve them. Explanatory notes will be accompanied by musical examples attached to the text.