I was wondering why you chose to do the prelude at the relatively slow tempi. On the harpsichord, Ralph Kirkpatrick does it much faster. Now, a piano has less sostenuto than a harpsichord, so the natural direction would be to go in the opposite direction, to do things faster rather than slower. I'm not saying it's wrong; I just wonder what your rationale is. I do find that, at the tempo you chose, pleasant resemblances of the harmonies to those of the middle movement of the fourth Brandenburg concerto become more noticeable.