As an amateur organist and avid traveler, I've found myself within earshot of several of the instruments included here. I never expected to find a guidebook dedicated to them, but here it is. And what a fantastic book it is!
There's so much good stuff in these 200 pages it's hard to know where to begin. The bulk of the book is a catalog of the churches and organs associated with J. S. Bach. There are about 30 of them, concentrated mostly in Saxony and Thuringia. Each site includes an architectural description, organ specification, organ history, FANTASTIC color photographs, and photos and facsimiles of correspondence from Bach. The book includes a glossary, instruction for how to examine an organ, and short biographies of organ builders.
The instruments featured here, as one would expect, are Baroque in design and temperament. Readers looking for any treatment of French Romantic or American Symphonic material should look elsewhere.
I would recommend the book to serious students, builders and musicians as well as enthusiasts. Basically, if you find yourself here, you should buy this book.