Proceeding from Josef A. Jungmanns groundbreaking book of the same title, this volume gathers new work from fifteen renowned scholars on christological and trinitarian themes in prayer and worship. Eastern and Western traditions, Catholic and Protestant, ancient and contemporary are all represented in this record of the 2005 meeting of the Yale Institute of Sacred Music. Collectively, these practitioners and theologians, from their varied settings, grapple with the competing ideas and expressions of christological and trinitarian doctrine in meaningful liturgy.