Jesus Christus, unser Heiland

The composer of this piece is anyone's guess, as again, he isn't mentioned in the manuscript. Two things are certain: he or she knew his trade, and it was written in the early years of the seventeenth century. The latter is obvious from the fact the piece is written in d dorian. And that is not always easy on our modern ears: we would write b flat most of the times were in this piece b is written.