This riff also includes a section of diatonic 3rds that outline the chords of G major ... ideas from familiar blues-rock phrasing but with a harmonic twist due to the scale’s chromatic layout.

In bar 2, I imply, or describe, an A9 chord sound (A, C#, E, G, B) with the notes ... as I descend the A blues scale while also touching upon the chord’s major 3rd, C#. When the progression ...