The edition has been based on the 5th volume of the facsimile series (Bach works) published by the Deutscher Verlag für Musik, Leipzig in 1971. In shaping the text of the publication we also studied the major Urtext editions in general use today. The text variants of an Urtext validity which by and large equal the main text, are given in ossia. The editor's addenda are put in square brackets, or in the case of ligatures, are marked with broken lines." (István Lantos)