The "O" Antiphons have been prayed for over a thousand years as part of the Vespers services during the fourth week of Advent. Marty Haugen's setting (using five of the seven antiphons) is appropriate during Advent and for any occasions that focus on longing for God. The contrast of the minor and major keys expresses yearning for God's promised reign in Jesus juxtaposed with our hope that God is with us.