It is a very well written and involving essay, positioned right in the middle between a specialist research book and a novel on the life and works of one of the greatest French romantic organists. The whole work is full of extraordinary documents, pictures (most of them taken from Widor's descendants personal archive and shown for the first time), excerpts from Widor's writings and other commentators, etc.
Very well written, suitable also for a non-technical audience. The only criticism would be the insertion of very short paragraphs within each chapter. Even if it can be appreciated given this is a work by a US author, where this practice is widely spread, I personally found too tiring and disruptive to have micro sections in each chapter. 5 stars.