Watch the Auxiliary Blues Scale online guitar lesson by Tom Dempsey from Jazz Scales Handbook
With the blues scale now in our sphere of understanding, we're going to move into a scale known as the auxiliary blues scale. This name comes from the definition provided by George Russell; pianist, composer, arranger, and author of the landmark book The Lydian Chromatic Concept.
With this scale, we take the same intervals of the blues scale learned previously and add one more chromatic passing tone between the b3 and the 4th (the major 3rd). This allows for a chromatic line to exist from the b3 of the scale to the 5th degree. It also allows for the sound of the dominant seventh chord to be more prevalent.