This volume draws together a collection of Robin A. Leaver's essays on Bach's sacred music, exploring the religious aspects of this repertoire through consideration of three core themes: liturgy, hymnology, and theology. Rooted in a rich understanding of the historical sources, the book illuminates the varied ways in which Bach's sacred music was informed and shaped by the religious, ritual, and intellectual contexts of his time, placing these works in the wider history of Protestant church music during the Baroque era. Including research from across a span of forty years, the chapters in this volume have been significantly revised and expanded for this publication, with several pieces appearing in English for the first time. Together, they offer an essential compendium of the work of a leading scholar of theological Bach studies.