The choir is a community with rules, relationships and purpose. When located in a prison, it takes on the therapeutic function of providing a protected space for expression and a context for reframing, even when its manifest goal is educational. This paper documents the establishment, by a professional musician and music educator, of a multi-vocal choir for women inmates in an Israeli prison. It examines the many aspects of the multi-vocal endeavour that address the therapeutic needs of prisoners at an individual and interpersonal level, and considers the potential as well as the limits of such a choral project as a therapeutic intervention.