The article concerns the issue of music in the cult, Polish Reksio series that was produced in the years 1967–1990 by Studio Filmow Rysunkowych in Bielsko-Biala. It is a brief summary of the thesis on which the article was based (Katarzyna Babulewicz, Zenon Kowalowski’s Film Scores for the Selected Parts of the seria ‘Reksio’, Cracow 2013). The main area of interest is the form of music and its diverse features and functions. Because this issue has not been a subject of any scientific publication so far, the author began her studies from the very beginning, from the interview with the composer Zenon Kowalowski and a visit to the Studio Filmow Rysunkowych in Bielsko-Biala. Detailed analysis of the music are based on videos and on scores (which have been kindly shared by SFR). This article is divided into four parts. The first part contains a brief biography of the composer’s art. The second part is a collection of different types of information (working method for film music, its features and the composer’s memories and anecdotes associated with the production of the series), which were collected during the interview. The third part is a detailed author’s analysis of the one movie from the series (the details of solutions specified by the composer have been indicated). The fourth part is an attempt to determine the common characteristics of music throughout the series. Contained proposals also include two other movies, where detailed analysis is in that thesis. During the study of the music the author has found features that had been specified by the composer himself and the set of other regularities, especially the original meaning assigned to specific instruments, articulation, form, and texture, as well as the most common ways of expressing certain emotions and moods.