The task of increasing trust is central to restorative peacebuilding. Between confidence and faith, trust bridges actions, beliefs and feelings of the past, present and future. Musical interaction can help build trust between participants. This is one of the reasons musical projects can be an effective part of conflict transformation. In this contribution I consider answers to key questions about trust offered by competing universalizing theories and culturally distinct groups of people, before suggesting a broad processual definition. I also show some of the ways music making relates to trust through a consideration of musicological literature and my own research in Colombia.