A joint research project "Meaningful Music in Healthcare" (2015-2017) took place as a collaboration between the research group Lifelong Learning in Music and a surgical research group of the University Medical Center Groningen. The project is built on the interplay of three groups of agents: the musicians, the healthcare professionals and the patients. The outcomes of the research project were presented with a focus on the reciprocal mutuality that can be understood as a "pas de trois".