This is an instructional book that I refer to on a regular basis. It is suited to all skill levels as it takes you from the basic fundamentals through soloing on both double bass and bass guitar. Aimed mainly at the jazz players, it can be used effectively for all styles of music. I myself play folk/blues/roots music. This edition did not come with a CD or tape, I don't know if later editions have or not. Raised by a jazz bassist, I was required to learn double bass before a bass guitar would be financed for me as a teen. I pretty much ignored the upright after graduation, concentrating on bass guitar for most of my career. I picked the acoustic back up in my early 40's and started to concentrate on it, but was getting frustrated with all the guys on double bass forums telling me I couldn't use 'bass guitar technique' to play this instrument. A few other methods were referred to me, and I felt so much like a beginner that I almost gave up. I had been given this book (had it for almost a year) and finally decided to open it. Sher shows you movable patterns for scales, arrpegios, interval exercises and other lines that you can learn and use all over the fingerboard. Simultaneously showing you fingerings for each instrument (there are slight differences due to the physical characteristics of each instrument) and specifies whether what he is showing you is specific to one instrument or the other. In other words, the moveable pattern philosophy that I used for decades on bass guitar, Sher is saying I can use on the double bass with a couple of minor tweaks in fingering. This is aimed at the players who play mainly pizzicato, so he doesn't really get into bowing technique that much (if at all), but as a reference tool for general playing from beginner to advanced, it is a wonderful resource.