Step by step lesson by Achim Kohl. First, the (very cool...) funky guitar groove is shown with 2 chords,
Then it starts with the improvisation: A minor blues scale in the 5th and 7th position, then the A dorian scale.
11 pages PDF with all scales, chords with neck diagrams, 5 improvisation examples with musc notation and tabs, 8 audio tracks including two backing tracks.