As Syria was one of the earliest centers of Christianity, its style of chant is among the oldest in the world. However, as no early musical manuscripts exist, it is conjectural to what extent the modern repertoire reflects the early traditions.
Velimirović, Miloš (1990). "Christian Chant in Syria, Armenia, Egypt, and Ethiopia". In Richard Crocker and David Hiley. The New Oxford History of Music: v.2 The Early Middle Ages to 1300 (2nd ed. ed.). Oxford University Press. pp. 3–9. ISBN0-19-316329-2.