I have played Bach for over forty years on guitar. Indeed, the piece that was probably more influential than any other in causing me to study classical guitar in a disciplined way was the Chaconne from the D minor Partita for violin. Andres Segovia transcribed it for guitar and ever since, it has been at the pinnacle of the guitar repertoire. Let's have a listen to John Williams. This is from a concert in Toronto in 1987 and I think the quality of the performance more than makes up for the quality of the sound.
Ironically, I have never quite gotten around to playing the Chaconne in concert, though I have played several lute and cello suites and many other individual pieces by Bach. In addition to giving hundreds of performances of the music of Bach, I have also read twenty or so books on Bach and an equal number on Baroque performance practice. I have also, of course, listened to dozens if not hundreds of other performers' interpretations of Bach. But I have never quite felt confident about how I play Bach and a couple of years ago I said to a friend of mine, who has also played Bach for forty years or so that "I don't know how to play Bach." She looked at me with frank astonishment! Why would I say that? Bach poses big challenges to a performer. Big challenges. I think that I had gone through a period of real growth in my musical understanding, perhaps sparked by a greater focus on my own composition, and as a result, had come to feel that the way I had played Bach was perhaps not adequate. Mind you, I probably was starting to feel this about most performances of Bach!
So for me, the way forward, was to sweep aside all the underbrush, all the accumulated detritus of Bach interpretation and look at it with really fresh eyes. Step one, admit that you know nothing! I don't think most performers realize how much the way they play Bach is piggy-backed on the way generations of performers have played Bach. There are few that really make a fresh start. On the guitar, John Williams is one. But the greatest renewed approach to Bach interpretation is, of course, Glenn Gould, whose 80th birthday would have been yesterday. Let us listen to a whole bunch of his re-thought from scratch J. S. Bach. The Well-Tempered Clavier, Bk 1:
The unexamined interpretation is not worth playing!