The 'O' Antiphons: Latin and Greek with Gregorian Chant, Old Hymnary and Scripture References provides readers with the Great Antiphons, the Magnificat antiphons to be used during Vespers of the last seven days of Advent in the Western Rite of the Catholic Faith. They are also used as the Alleluia verses on the same days during Mass. Each antiphon refers to the prophecy of Isaiah in relation to the coming of the Messiah. The title of each antiphon is one of the names of Our Lord, Jesus Christ, and one of His attributes as mentioned in Sacred Scripture. The antiphons are presented in Latin and English, with both Gregorian chant notation and old hymnary music. Abundant Scripture references are given for each antiphon.