Ancient ideas on sacred sound find a very tangible and lively expression in the practice of kirtan, which is a broad term referring to various forms of devotional singing commonly done in South Asian traditions. Kirtan is a core practice in the Hindu and Sikh faiths that is becoming increasingly popular around the world among people of all ethnicities, thus developing as a transnational and transcultural phenomenon. Indeed, the broader cultural implications and deepening social penetration that this practice has achieved over the past five decades suggest that it is attaining permanent status in the world’s religious soundscape. Sacred Sound and the Transcultural Practice of Kirtan explores the practice of kirtan as it has been re-created in the United States, Canada, and Brazil through multi-sided interactions that generate new cultural patterns in an ongoing process of cross-pollination. Approaching kirtan as a type of ‘technology of the self’, Gustavo Moura combines textual, historical, and ethnographic sources to address the questions of how this practice is adopted and adapted in the Americas and how it has been shaping identities, communities, and traditions.