The Divine Liturgy of St. John Chrysostom is traditionally thought to be a shortened form of the Divine Liturgy of St. Basil. Both are related to the earlier Divine Liturgy of St. James of Jerusalem, which is traditionally attributed to the first bishop of Jerusalem, James the Just (not to be confused with James, brother of Saint John the Evangelist). It is celebrated once a year on his feast day, traditionally only in Jerusalem, but now in other places as well.
Structure
Note: Psalms are numbered according to the Greek Septuagint. For the Hebrew Masoretic numbering that is more familiar in the West, usually add '1'. (See the main Psalms article for an exact correspondence table.)
The format of Divine Liturgy is fixed, although the specific readings and hymns vary with season and feast.
While arrangements may vary from liturgy to liturgy, the Divine Liturgy always consists of three interrelated parts:
the Liturgy of the Catechumens, so called because in ancient times catechumens were allowed to attend, also called the Liturgy of the Word;
and the Liturgy of the Faithful, so called because in ancient times only faithful members in good standing were allowed to participate. In modern times, this restriction applies only to communication — reception of the sacrament of holy communion.
A typical celebration of the Byzantine Liturgy consists of:
Second Antiphon (usually Psalm 145; in the Greek rubrics Psalm 92)
with the Refrain (in the Greek rubrics) on Sundays: "Save us O Son of God who art Risen from the dead, Save us who sing unto you, Alleluia" and on Weekdays: "Save us O son of God who art Wondrous in your Saints..."°
Third Antiphon° (usually the Beatitudes with troparia from the canon of Matins, Odes 3 and 6; in the Greek rubrics, Psalm 94)
with the Refrain (in the Greek rubrics) on Weekdays: O Son of God who art wonderful in Thy saints, Save us who sing to thee, alleluia. On Sundays: the Troparion of the Day, Saint or Sunday Resurrection
Parts marked ° indicate portions that can change according to the day or liturgical season of the year. Some parts change at every Divine Liturgy, some parts only change at Pascha (Easter).
Note that almost all texts are chanted throughout the Divine Liturgy, not only hymns but litanies, prayers, creed confession and even readings from the Bible. The sole exception is the sermon.
Oriental Orthodox
The Coptic Orthodox have 3 principal Divine Liturgies:
The Liturgy of St. Basil
The Liturgy of St. Cyril
The Liturgy of St. Gregory
The Liturgy of St. Basil is celebrated on most Sundays.