Bach is my religion, and I am an adult beginner piano student, with roughly four years of classical piano lessons under my belt. Those two facts color my opinion of this biography and of other Bach biographies I have read, namely those by Christoph Wolff and Martin Geck. I do like the Peter Williams biography better than the other two. It is scholarly without being overly so, reverential without going overboard, analytical and informative on the music front without being exhaustive and boring. And I greatly enjoyed the approach of dissecting the obituary written at Bach's death, fleshing out the entries, and/or setting the record straight. The Wolff is very good but leaves me cold, and, to be honest, I couldn't make it all the way through the Geck. I am a tough grader -- hence the four stars. Though I found the Williams biography an extremely engaging read, I do think/hope that the definitive five-star Bach biography has yet to be written.