Johann Sebastian Bach: Wohltemperierte Klavier 2 1: Klavier Solo

All alterations and additions pursue the educational intent of affording the student insight into the mechanism of the composition. Moreover, they illustrate and supplement the views presented only in a sketchy manner in the introductions. In several cases, it takes the sum of the comments on the various pieces to constitute the all-encompassing opinion on one and the same question. (Ferruccio Busoni)