The O Antiphon for the Magnificat at Vespers on December 23:

O Emmanuel, our king and our Lord, the anointed of the nations and their Savior: come and save us, O Lord our God.

Healey Willan (1880-1968), professor at the Royal Conservatory of Music in Toronto and organist at St. Mary Magdalene Church in the same city, composed a setting of The Great O Antiphons of Advent for the Lutheran Church-Missouri Synod’s Concordia Publishing House in 1957.  Here’s Willan’s setting of “O Emmanuel,” as sung by the choir of Christ Church Cathedral in Vancouver, British Columbia:

O come, O come, Emmanuel,
And ransom captive Israel,
That mourns in lonely exile here
Until the Son of God appear. 

Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!

— Rick Krueger

(Image: O Emmanuel by Linda Witte Henke, Te Deum Designs.)