Open Access for this publication was made possible by a generous donation from Segelbergska stiftelsen för liturgivetenskaplig forskning (The Segelbergska Foundation for Research in Liturgical Studies). In a seminal study, Cur cantatur?, Anders Ekenberg examined Carolingian sources for explanations of why the liturgy was sung, rather than spoken. This multidisciplinary volume takes up Ekenberg’s question anew, investigating the interplay of New Testament writings, sacred spaces, biblical interpretation, and reception history of liturgical practices and traditions. Analyses of Greek, Latin, Coptic, Arabic, and Gǝʿǝz sources, as well as of archaeological and epigraphic evidence, illuminate an array of topics, including recent trends in liturgical studies; manuscript variants and liturgical praxis; Ignatius of Antioch’s choral metaphor; baptism in ancient Christian apocrypha; and the significance of late ancient altar veils.