NOW IN BASS CLEF by Oliver Nelson, and is one of the world's most popular patterns books which many jazz greats have fond memories of practicing from this book! An exhaustive collection of improvisational jazz patterns in various meters and feels. Comments and suggestions by the Oliver Nelson, a legendary composer, arranger, conductor and instrumentalist. This is a very popular book because it helps spell out some of the basic building blocks of the jazz language. Regarded by many jazz teachers as one of the essential texts for their students..