BackgroundSight-singing has been traditionally seen as a core musical skill to be achieved through an individual development even in contexts naturally of joint singing, such as a choir (Demorest, 2004; Pollock, 2017). Such a solipsistic approaching to sight- singing entails both to make and to communicate the sense of the music represented by the score, and to reject all possibility of collective construction of such a meaning. Alternatively, it is possible to think in a modality of participatory sight-singing, in which musical sense is made on the interaction with other reader. One dimension of this ?collective creation? of sense can be seen from an enactive perspective as "Participatory sense-making" (PSM) (De Jeagher & Di Paolo, 2007). In PSM agents keep their autonomy for making decisions in order to regulate the interaction. According to this, agents coordinate their intentional activity in the course of the interaction, affecting the individual sense-making processes and contributing to new domains of collective sense. From PSM perspective music performers could be considered interactive agents who communicate and negotiate their skills in real time (Schiavio & De Jaegher, 2017).AimsTo characterize joint sight-singing as an intersubjective process from the PSM perspective. In order to this, some microgenetic aspects of the basic sight-singing ability are analyzed in interaction with others.MethodParticipants: 12 novel music students (average age: 20 years). Apparatus: Performances were recorded with 1 digital recorder connected to 3 individual microphones, and filmed by 2 HD cameras. Design and procedure: Participants were divided into 4 trios. They had to read a sheet of music singing aloud the three together. Sound and movement analyses were run assisted by softwares for voice analysis (Praat) and video annotation (Elan) respectively.ResultsRecordings were analyzed according to three microgenetic variables: (1) movement initiative; (2) singing initiative; (3) vocal tuning profile (VTP). Microanalysis indicates that although one participant tends to take the initiative both singing (p