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#685 - Af Hoiheden oprunden er (From High there Flows—Norwegian) and #707 - Wie Schoen leucht uns der Morgenstern (How Brightly Shines the Morning Star—German) are the same melody, although some notes and the accompaniment differs significantly.
This melody was the basis of a cantata of the same name composed by Johann Sebastian Bach
(1685-1750) and first performed in 1725.