Note: Formally, this is closer to BWV 686 than it is to the Orgelbüchlein preludes, with a fugal Vorspiel on the incipit of the first verset followed by imitation on points derived from subsequent versets, albeit in 5 rather than 6 voices. The chorale melody is in the pedals; the version used is from the Erfurt Enchiridion of 1524. As a note to those who choose to print the score, it has been laid out for A3 format in landscape orientation.