Columbia subject headings:
Cyril, Saint, Apostle of the Slavs, approximately 827-869.
Gregorian chants--History and criticism.
Methodius, Saint, Apostle of the Slavs, approximately 825-884 or 885.
Neumes.
Paleography, Musical.
Sacred vocal music.
Harvard subject headings:
Byzantine chants--History and criticism.
Cyril, Saint, Apostle of the Slavs, approximately 827-869.
Methodius, Saint, Apostle of the Slavs, approximately 825-884 or 885.
Neumes.
Paleography, Musical.
Sacred vocal music.
Princeton subject headings: