There is an emerging interest in the literature base around the use of group singing in dementia care. Although studies indicate positive outcomes, limited research has been carried out from a relational perspective. Additionally, theoretical underpinnings of the reported benefits have yet to be explored. This study aims to investigate the key theoretical mechanisms underlying the experience of group singing. Interview data from seventeen couples who sing together in a group is analysed using grounded theory method. Several key aspects of group singing are presented, namely that the positive experience of the act of singing combined with effective group facilitation enables equal participation and a powerful group effect. A further benefit of new learning and creativity is explored. Implications for clinical practice and possible directions for future research are outlined.