This master thesis presents a study of a unique case based on the use of turn-taking to establish interaction with a child suffering from ASD in a clinical context. Starting from a phenomenological-hermeneutic qualitative design, it describes and discusses four events (video clips) of a music therapy treatment, using the method of the microanalysis. A narrative description is used, as well as a graphic template that represents the events and the quantitative table collection of the presence and evolution of the categories of observation: the child’s musical behaviours, expressive behaviours and musical elements, which maintain a relation with joint attention, affective harmony and interaction. This study reflects on how through turn-taking games and especially the pause and reflection, a means for interaction is provided, enriching the intersubjectivity and the development of proto-communication.