From the recording Every Groove A Bluesman Needs To Know
6-9 Groove in G
This groove starts on the five like described in groove #4 only this time the whole band comes in together. This bass line is classic box pattern. A box pattern means play the root note on beat one then hops an octave up to the root again on beat two, then comes down in kind of a box pattern on the neck of the guitar, hence the name box pattern. The cool thing, which makes this groove called 6-9, is what the guitar does. The guitar plays a chord called a 6th, and when this chord is lowered a whole step (two frets) it becomes a 9th chord. So the guitar just slides up and down going form a 6th to a 9th chord over and over and creates a groove that is flowing. You can hear this used on Stevie Ray Vaughan’s “Empty Arms” (studio version only).