Harp - Level 3 - Digital Download SKU: A0.771358 Composed by Traditional. Arranged by Cynthia A. Boener. Christian,Christmas,Classical,Concert,Standards. Score. 2 pages. Cynthia Boener #3907395. Published by Cynthia Boener (A0.771358). Also known as the O Antiphons (each verse begins with the word O), this hymn, whose words date from the 8th century, was originally a set of plainchant antiphons typically sung during Vespers on the final days before Christmas. These antiphons gradually evolved into the hymn form that we know today. This lovely arrangement is a joy to play.