Making music in groups is a widespread human activity and a powerful medium for nonverbal communication, social bonding, and cultural transmission. While essentially a vehicle for affective and aesthetic expression, group music making can also be viewed as a microcosm of social interaction to the extent that it draws on a broad spectrum of sensory, perceptual, cognitive, motor, and emotional processes that support collaborative behaviour more generally in everyday life. This course will address the mechanisms supporting human interaction through music from the perspectives of evolutionary biology, psychology, and cognitive neuroscience. The aim is to survey and critically evaluate state-of-the-art research on musical interaction, focusing on why do we do it, how it works (and what happens when it doesn’t), and potential implications for pedagogy and applications in clinical settings.