Question about the Song of David

when David played and "he pleased the Lord"------that scene where the young actor playing David sings for the troubled king.....is it available anywhere?, and was it (that melody set to the Lords Prayer) only made for the movie?

(and no, this does not refer to the Leonard Cohen song Hallelujah)-------it's the heartbreakingly beautiful song young David plays on his rustic harp instrument.....oh-----so gorgeous!