Columbia subject headings:
Church music--Orthodox Eastern Church.
Hymns, Greek--History and criticism.
Music, Byzantine.
Musical notation.
Harvard subject headings:
Church music--Orthodox Eastern Church
Hymns, Greek--History and criticism.
Music, Byzantine--History and criticism.
Musical notation.
Princeton subject headings:
Church music--Orthodox Eastern Church.
Hymns, Greek--History and criticism.
Music, Byzantine.
Musical notation.