Trio for clarinet, viola and piano was my first atonal composition. Its style evidently is still influenced by composers from the beginning of the 20th century. The last part (Adagio Notturno ) clearly refers to Béla Bartók’s 'night music'. The second part (Allegro Robusto ) reminds us of the early 20th century composers by applying irregular bars and time signatures. Having completed this work I finally was able to write my own ideas on paper in an unlimited way; I even looked for a possible own structure or legitimisation. In this composition one can find the first occurrence of my preference for symmetrical chords and a free improvisational rhythm (such as fully written quintolas) at the surface. This will play an important role for my next compositions. In that sense I consider this Trio as an important work for my compositional evolution. Although the piece may be considered as 'free atonal', the composition is based on recognizable themes occurring in several movements, yet now and then in a polytonal context.