Coker's books were how I learned the basics of jazz theory back in the
mid '70s. Where I think he goes astray is emphasizing patterns and such,
but I'd be lying if I said that I didn't learn a lot of information from
him. I think that his next two books, "Listening to Jazz" and "The Jazz
Idiom" are both good as well. "Practicing Jazz" and "The Jazz Language"
I wouldn't recommend at all; that to me is where his pedantry really
starts to come out.
Clay