This book offers an enjoyable and highly-informative survey of jazz from its earliest precursors in Congo Square to its modern-day postmodern conservatory-trained professionals. The contours of the story are familiar enough, but it is useful and relatively complete.
The book is punctuated throughout with several dozen listening exercises in which the authors closely analyze a particular song that illuminates an important artist or style, calling attention to what the musician is doing and what is of interest, second by second. Almost every example is available on Spotify, and it probably goes without saying that it's crucial to find the specific versions the authors analyze. Duke Ellington probably recorded "Mood Indigo" at least a dozen times, but to really benefit from their analysis, you have to dig a bit to find the one from 1930.
It's an excellent and useful approach, which I assume is probably modeled on the authors' experience as university teachers. Like an introductory survey course on jazz history, you get a bit of narrative followed by a close listen with commentary, and then on you go.
There is some formal analysis but the book presupposes almost no knowledge of music theory, though some the examples sometimes reference a V chord or a diminished fifth. Personally I would have preferred a bit more theoretical analysis, but then it would have been a different kind of book, and would probably have turned off a lot of potential readers.
The story of jazz cannot be told without to some degree telling the story of race in twentieth century America, and I think the authors handle this very well, plainly stating what I take to be a very reasonable account of the plain facts of the savagery of racism and its intensely-destructive effects. I appreciate that this historical context is included, but never spins out and overtakes the larger story of the music and the art.
In part because I feel that they handled the race component so well, I am somewhat disappointed with how the authors tackled gender, or failed to tackle it, as the case happens to be. Of the several dozen artists they analyze in their examples, there are exactly three female jazz musicians, all of them singers, and if you are a jazz fan, I don't have to tell you who they are - you already know. Mary Lou Williams is discussed, but her music is not analyzed.
On the whole, this is an excellent book. I really enjoyed the focus and the tone, and came away with a useful overview of the primary currents that have shaped this great art form for more than a century. I think anyone who has struggled to make sense of its long history or how to understand its music will come away with a deeper appreciation of the genre.