Watch the Double Stops online guitar lesson by Jimmy Reiter from Soul Guitar Guidebook
Soul guitar solos and rhythm parts are full of double stops. Using typical intervals like sixths and thirds will instantly give your playing a touch of soul. Steve Cropper, one of the greatest rhythm guitarists of all time, played hundreds of double stop licks on soul classics such as "Soul Man" or "The Dock of the Bay".
The intro to King Curtis' "Memphis Soul Stew" is another great example of this concept. The guitar player is sliding sixth intervals across the fretboard, creating a funky, instantly recognizable lick.