Duke Ellington's nephew, Stephen James has taken steps to set the historical record straight in a thoughtful calling out of Mr. Teachout and his Duke: A Life of Duke Ellington. Mr. James' essay is to be found online at
http://jjs.libraries.rutgers.edu/index.php/jjs/article/view/77
As I mentioned to a friend today, when we were growing up musically we had WQXR's John S. Wilson to contend with. Today Terry Teachout of the Wall Street Journal is our burden.
For those who desire to know, David Schiff's The Ellington Century and, of course, Gunther Schuller's writings on Ellington and much else are the places to go.