Watch the Example 18 online guitar lesson by Brad Carlton from Guitar Lab: Boogie-Woogie
Now we get into some "open sounds" with unique voicings. A mixolydian is the source with the chords being: A7 no 3rd, A 6/9 no 3rd, A9 no 5th and back to A 6/9 no 3rd. Notice how voices 2 and 3 are intervals of seconds. The 1st voice is 5, 6, b7, 6 which maintains the boogie-woogie vibe.