Watch the Let It B online guitar lesson by Jeff McErlain from Play in the Style of Billy Gibbons
Here's a great example of Billy's use of an open string against other notes moving around. This link is something similar to what Billy plays in "Blue Jeans Blues" and it was a real eye-opener for me as a player. I am not alone in this as this particular tuned inspired David Grissom as well. What is so cool about this lick is the use of the open B string in combination with the B minor pentatonic scale. The open string is the root of the scale as we play scale tones below it. That is a cool idea to run with yourself and we will also see other licks using this concept coming up. For example if you went to the key of G minor you could use your G string as the open string and play the notes of G minor pentatonic below it. Interestingly enough, the open string does not have to function as the root. For example the G string could function as the fifth in a C minor pentatonic scale to create a whole different sound. This sound can be heard on the main riffs of "Cheap Sunglasses" and "Sharp Dressed Man".