From the Publisher
This book is ideal for most levels of musicianship, from the beginner/ intermediate student who is interested in understanding and playing the Blues to more advanced players that need new ideas to help stimulate their creativity. It is also useful as a tool for improving one's sight-reading abilities with the examples being in many different keys and rhythms. The 12 bar Blues progression and the Blues scale are also explained.
Difficulty level, roughly compared to ABRSM exam grades. 0 is beginner, 9 is advanced (beyond grade 8).