Jordon Ruwe's great display of tools for any musicians improvisation needs. The approach to all the keys embodies the essence of BOP, and will help strengthen the parameters of harmonic and melodic lines for perosnal development and growth. Giving a clear organization of the twelve keys and concise lines throughout containing quality harmonising logic and continuity, this book proves to be a usefull exercise book providing great warm-ups for the true professional Jazz Musician.