Great work !!!! for the professional or the amateur. ALL THERE !!! not to read from beginning to end, but "flit" from theme to theme (read very original zigs-zags) with aspects rarely discussed: the tempo, for example. And full of ideas to create exercises to improve his weak points ... In summary, I find this book ESSENTIAL! (I read a few pages each day: I started with the intro, then a little chapter 9 and chapter 1 a bit, then a little chapter 8, in short we forge his own journey !!!! ) Very readable, enjoyable and CLEAR!