Using the Principal chorus of the various manuals of the Northern European Cathedral Organ (NECO) - "A Mighty Fortress Is Our God" (German: "Ein feste Burg ist unser Gott"). This is one of the best known hymns by Martin Luther. Luther wrote the words and composed the melody sometime between 1527 and 1529. It has been translated into English at least seventy times and also into many other languages. The words are a paraphrase of Psalm 46. See http://organ.etcetera.cc/major-ii-neco/