Watch the Example 6 online guitar lesson by Brad Carlton from Guitar Lab: Boogie-Woogie
This passage is the same as ex 5 except the 2nd voice moves 1, 2, 3, 2. The chords are A, Bm/A, A7, Am/A, Bm/A. These chords come from A mixolydian. I will show you several variations of this pattern in the video, so study both hands and listen closely.