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Cette thèse s’intéresse à une période stylistique particulière du compositeur Frédéric Chopin. Les années 1840 manifestent une évolution importante dans son langage musical et correspondent à un tournant esthétique marqué par un contexte historique et biographique difficile. Tout au long de ce travail, nous allons tenter d’ériger une définition transversale du « dernier style » de Chopin, en recherchant les éléments caractéristiques récurrents de cette période. Dans ce but, un corpus de vingt-deux œuvres musicales sera analysé selon plusieurs niveaux (traditionnel et formel, sémiotique, narratif et thymique) afin de saisir tous les enjeux de la dernière période du compositeur polonais. / This thesis focuses on a particular stylistic period of Frederic Chopin. The 1840s show an important evolution of Chopin’s musical language and correspond to an aesthetic turning point, characterized by a difficult historical and biographical context. All along our research, we will try to build a transversal definition of Chopin’s last style by highlighting the recurrent characteristics of this period. In this purpose, a corpus of twenty-two works will be analyzed through several levels (traditional and formal, semiotic, narrative and thymic), to grasp all the issues of the last period of the polish composer.

One of the difficulties of nineteenth-century form studies is ambiguity in ascertaining which formal types are at work and in what ways. This can be an especially difficult problem when multiple formal types seem to influence the construction of a single composition. Drawing on some recent innovations in form studies proposed by Steven Vande Moortele, Janet Schmalfeldt, and Caitlin Martinkus, I first develop a set of analytical tools specifically made for the analysis of sonata/variation formal hybrids. I then refine these tools by applying them to the analysis of two pieces. Chopin's Fourth Piano Ballade can be understood from this perspective as primarily following the broad outlines of a sonata form, but with important influences from the recursive structures of variation forms; Franck's Symphonic Variations, on the other hand, are better viewed as engaging most of all with multiple variation-form paradigms and overlaying them with some of the rhetorical and formal structures of sonata forms. I conclude with a brief speculation on some further, more general applications of my methodology.