Johann Pachelbel, Vom Himmel hoch da komm ich her
Pachelbel's prelude to "Vom Himmel hoch da komm ich her" / "From Heaven Above to Earth I Come" has the choral melody in the bass. I read somewhere, that the hands accompany the melody in a two part texture. The same technique is often used by Johann Michael Bach and also by Johann Bernhard Bach in his prelude to the same choral. It is a hymn text relating to the Nativity of Jesus, written by Martin Luther in 1534. The song is an interpretation of Luke 2:8-18, a part of the Christmas story (Bach Cantata website).