The System page of this web site is a quick study of the system. There are 15 downloadable PDFs just click on the larger image to download the lesson. Now quite frankly if you study this you probably won't need to buy the book. Of coarse you will really need to put your thinking cap on and put two and two together. In the end it would probably be better for you. The book covers a lot more territory and explains music into a very easy to understand method, dare I say method. I would merrily describe it as a logical conclusion to understanding chords which I have seen a few imply but no one actually put in motion. And so... here it is "The Working Guitarist's Chord Dictionary".