The aim of this research was to determine whether musicians in the improvisational music context experience Flow, and to examine the relevance of environmental conditions of musical performance on the Flow experience. Two participants were chosen for this research, primarily because of their rich experience in performing improvised music concerts. Croatian translation of the Flow State Scale was used for collecting quantitative data in this research, and the participants had to fill out the questionnaires immediately after music performances, not only after concerts, but after rehearsals, studio recordings and practicing sessions as well. Semi-structured interviews were conducted on two occasions, once before and once after the questionnaire part of the research – they also differed in the sense that different aspects of the improvisation experience were discussed each time. It is important to mention that questions about the flow experience were never asked directly, rather, descriptions of the flow experience were to be found by analyzing the information collected by talking about different aspects of improvisation. The results confirm that the musicians in the improvisational music context actually experience at least some characteristics of the Flow experience – specifically, complete concentration on the task, sense of being in control, loss of self-consciousness and a feeling that the experience is intrinsically rewarding.