Svetlana Kujumdzieva, Dr. of Sciences, is Professor of Medieval Music at the National Musical Academy "Prof. Pancho Vladigerov" and Theological Faculty of the Sofia State University "St. Clement of Ohrid"; academician at the Bulgarian Academy of Sciences. She has published 12 monographs and more than 150 articles in Bulgaria, Austria, Denmark, Finland, France, Germany, USA, etc. Kujumdzieva was an associate member of the John W. Kluge Center at the Library of Congress in Washington, D.C., the Resource Center for Medieval Slavic Studies at the Ohio State University in Columbus, OH, St. John's College, Oxford, GB, etc. She is a member of many national and international scientific organizations.

This book focuses on the compilation of the different practices of Eastern Orthodox Chant, looking at the subject through various languages, practices, and liturgical books and letters.

Foreword: Eastern Orthodox Church Chant at the Crossroads of Traditions / Part I Studies on Genre / Psalm 140: Versions and Redactions (1995) / The Kekragaria in the Sources from the 14th to the 19th Century (1997) / The Akathistos Once Again (1998) / The Byzantine-Slavic Sanctus: Its Liturgical and Musical Context (1998) / Part II Studies on Liturgical Books / The Tropologion: Sources and Identifications (2018) / The Tropologion Vaticanus Graecus 771 (2020) / The Tropologion Vaticanus Graecus 2008 (2011) / The Notated Repertory in the Early Oktoechoi Revisited (previously unpublished) / Studying the Oktoechos: from the Oktoechos to the Anastasimatarion (2010) / Part III. Studies on People / St. Cyril and St. Methodius: The Roots of Slavic Orthodox Church Chant (previously unpublished) / Metropolitan Theoleptos of Philadelphia: Between Tradition and Innovation (2013) / Hieromonk Evstatie of Putna: The Putna Music School Revisited (previously unpublished) / Metropolitan Serafim of Bosnia: The Graeco-Slavic Contacts in Balkan Orthodox Church Chant (2018) / Part IV Studies on Bulgarian Orthodox Church Chant / Melismatic Chants Related to Bulgarian Church Chant up to the Fifteenth Century (previously unpublished) / Musical Performance from the Fifteenth Century (previously unpublished) / "Bulgarian" Chants in Musical Manuscripts (2013) / The Transition from Monophonic to Polyphonic Church Music: The Case of Bulgaria (previously unpublished)