How to write about music

 I read parts of two books about jazz / Spain coincidentally, because of two requests that I received at the same time, one for a blurb, the other for a promotion review.  Of these, the one I found more convincing was the one that evinced a great depth of knowledge about the music itself. Both books deployed a lot of theory, in different ways, but in one case it was more abstract and less rooted in an actual understanding of jazz and how it works.