As a main task in my bachelor´s thesis I chose to resolve especially a technical problems of bassoon?s parts of Six sonatas by Jan Dismas Zelenka and to try to facilitate the playing of interprets as much as possible. Next fundamental issue which I decided to solve is an interpretation and its phrasing. Also we can find in this thesis humble analysis of sonatas and important informations about their origin. I devided my bachelor?s thesis in three chapters. In the first one I deal with the life of Jan Dismas Zelenka, in the second one with the origin of cycle of Six sonatas, the exact titles and the structure of individual sonatas. In the third chapter I?m engaged to mentioned technical problems, I solve the possibilities of practice, phrasi...