This study explores how the chronotope, a particular time-space, of a collective in-time experience through music takes shape through the individual and interconnected actions and responses of a teacher and students in joint music-making. The dataset consists of video recordings of a joint music-making lesson (45 min) and the interviews of the teacher and 23 sixth grade students. This study provides insights into the multimodal nature of music as the primary mediator of interaction, and how the chronotope of interpersonal entrainment is curated and experienced in joint music-making.