Error of the 20th century

2nd Suite  in D minor  BWV 1008

Gique, Bar 28, last note: most editions of 20th century (such as Wenzinger, Fournier, Tortelier, Henle, etc.) take b-natural according to Anna Magdalena Bach (AMB). But it is probably an error.

Kellner and Souces C and D take e as below. The notes d-e-f draw natural ascendant line.

   Kellner:

  
   Source C:

   Source D:

 

There is a parallel period from bar 61 but it isn't the same. In the bar 65 (far right), the diminished 7th (c-sharp - b-flat) is divided into two 16th notes, so it is natural to draw descendant line (g - e - c-sharp).

Most editions of the 19th century such as Paris first edition (1824), Dotzauer (1826), Bach Gesellschaft Ausgabe (BGA/1879), Klengel (1900), etc. had taken e. But after publishing Alexanian edition (1929) that includes the facsimile of AMB's manuscript, most editions followed it.  

   Dotzauer: 

   BGA:

 

History sometimes regresses.


By the way, some cellists play as follows:

They are right because they aren't content with AMB, but of course it is an incorrect solution. Composer often avoids to repeat the same thing.