Was Gott thut, das ist wohlgethan
Choraldurchführung (Chorale prelude on the complete Cantus Firmus)
Johann-Gottlob-Töpfer-project (all in all 54 compositions), using the organs Gönningen, Tholen and Wernigerode.
See for more informations my essay "Playing Johann Gottlob Töpfer and Bach's Passacaglia" in THE BARDE