This book and more importantly the CD is a great practice aid. It comes with a number of tracks in many styles, keys and progression. The tracks start out with simple one chord jams and work up to very complicated chord progressions. The accompanying book contains the transcribed chord chart with suggestions for scales, key center etc. This information is key to using the CD.The backing band is very professional and the chord progression can be very demanding. All in all an excellent tool to further developing your shops - intermediate to advanced players will get the most out of this set.