The chorale prelude on “Lobe den Herren den mächtigen König” by Kirnberger is contained in at least two manuscripts, both owned by the Staatsbibliothek Berlin: Am B 396 and Mus.ms. 11633/25. The versions in both manuscripts differ from each other. The general outline is the same, but lots of little details are different. Hence the decision by Ruth Engelhardt to give both a seperate number: 210a and 210b.