Not that it has to do specifically with Annunciation, but this comes from St. Dunstan's Plainsong Psalter, used by the Antiochian Western Riters, and is the Marian anthem sung during this time of year. Thought it appropriate to post today:
Queen of the heavens, we hail thee,
Hail thee, Lady of all the Angels;
Thou the dawn, the door of morning,
Whence the world's true Light is risen:
Joy to thee, O Virgin glorious, Beautiful beyond all other;
Hail, and farewell, O most gracious,
Intercede for us alway to Jesus.
Vouchsafe that I may praise thee, O holy Virgin.
Give me strength against thine enemies.
Let us pray:
We beseech thee, O Lord, mercifully to assist our infirmity: that like as we do now commemorate blessed Mary Ever-Virgin, Mother of God; so by the help of her intercession we may die to our former sins and rise again to newness of life. Through the same Christ our Lord.