Volume 6 contains the chorale-related organ works that Bach personally had printed: the ""Dritte Theil der Clavier Übung"" was published (""for organists"") in 1739; the ""Sechs Choräle von verschiedener Art"" (""Schübler-Choräle"") and the ""Canonische Veränderungen"" were released in separate editions most likely in 1747/48. None of these collections had from the start the appearance which the composer considered as valid in the end. For this reason, Werner Breig focuses in particular on questions of originin his introduction. Fundamental findings on the genesis of the ""Clavie r Übung III"" were made only after the publication of the work in the ""Neue Bach-Ausgabe."" The basically unproblematic state of the sources meansthat this volume contains no CD-ROM with supplementary materials. It wa s, however, considered editorially necessary to print the ""Canonische Veränderungen"" BWV 769 in three versions: as a facsimile of the original print, in a practical arrangement, and in the autograph version (BWV 769a).