Deals with the often neglected but most important foundation of Blues Music (Rhythm Guitar) in a logical order from the ground up. Some of the knowledge I was already aware of e.g. 12 bars, 1,4,5's & 7th chords. However what I did find more useful to me as a intermediate level guitarist was the section where the extended chords were being introduced. I can see myself getting a lot of good ideas out of this to take my Blues Rhythm playing to another level. Now if I could only just quit my job.