Group singing is a common feature of classroom-based music education, and has often been proposed to have benefits that extend beyond acquisition of music skills, primarily in academic achievement. However, potential social and emotional well-being benefits have been under-represented in these discussions. This article proposes that an evolutionary lens provides a helpful framework for understanding how music education can contribute to student well-being. Specifically, group singing may a) create a shared emotional experience which is generally positive; and b) increase group cohesion and pro-social behaviours. It is proposed that, while these changes are generally immediate and short-term, regular participation in group singing may lead to stable, persistent changes in affective style and sociability. The implications for music education are discussed, particularly for improving the social and emotional wellbeing of students.