Harmonica Thesaurus Author:Les Murzsa Musical Source Material for Diatonic and Chromatic Harmonica Contains jazz and blues theory approaches to harmonica; diagrams of diatonic harmonicas with the chromatic additions; diagrams for twelve keys on a single diatonic; scale syallabus and much more. This is not a method book that tries to influence your style, this is a reference sour... more »ce. It is meant to provide harmonica players with the base of knowledge needed to expand beyond simple 1st position folk and 2nd position blues harp styles.« less