The Composite Blues Scale for Electric Guitar
This book can be downloaded and read in Apple Books on your Mac or iOS device.
Instructional Music Notation & Tabs With 60 MP3 Audio Tracks for the Guitarists who want to improvise with the Composite Blues Scale and improve their Blues vocabulary over the dominant, major, minor 7th and minor 7th B5 Chords.
Composite Blues Scale
I found this book to be invaluable. By using the concepts in the book it has expanded my ability to improvise.
Remarkably when I had a question I wrote to the author and he was kind enough to reply and provide the answer.