Organ - Level 3 - Digital Download SKU: A0.842646 Composed by 13th Century Plainsong. Arranged by David Christensen. Christmas,Classical,Concert,Sacred. Score. 4 pages. David Christensen #6233759. Published by David Christensen (A0.842646). This is an organ arrangement of the 13th century plainsong Divinum Mysterium using the text Of the Father's Love Begotten.  Near the end of the arrangement it incorporates the melody of The First Noel.  It is suitable for a 2 manual organ.