From a Canterbury Psalter, MS Cotton Vespasian A.I, fol. 30v.
David plays his harp and composes the psalms while amanuenses on his right and left write down his words. His harp strongly resembles the Anglo-Saxon harp discovered in the Sutton Hoo burial. The image picks up on the many references in the Psalms to dancing, the clapping of hands, and music played on the harp and horn.
Read more about King David.
Source: Wikimedia Commons