The theory concerning the hidden choral lines put forth in the CD jacket is interesting, though its somewhat pretensious tone is somewhat off putting in places. While I am an avid listener of the choral music of Bach and others, I am certainly not musically qualified to make any judgement regarding the reality of the hidden coral lines. However, I can say definitely that it "works" for me, whether by original design or indirectly through the brilliance of Bach and the skill of these performers.