This lesson is about a 12-bar blues in the key of Bb included two guitar transcriptions with tabs : a guitar walking bass line for the accompaniment and a guitar improvisation to solo over.
Note that this study is based on a common blues jazz progression? but with a descending chromatic progression in bars 7 & 8 using three dominant 7th chords (Bb7, A7, Ab7) to approach G7 at the end of the bar 8.