Certainly Pops is a great candidate, since he pretty much invented the modern concept of soloing in, around and on top of the beat. His elastic sense of time made it possible for all subsequent explorations of the beat in Western popular music. But how about Charlie Christian? Can someone think of a person that played the guitar like he did before his arrival, and can anyone identify an important guitar stylist from a later era that did not display some critical element of Christian's style? In fact, you could argue that Christian's innovations inspired subsequent guitarists, and even vocalists to use horn-like phrasing. A case can also be made for Albert King, as every major blues and rock guitarist since him has used his style of attack and note bending. Its true that BB preceded Albert and is every bit as great, but for some reason everyone still tries to sound like Albert in some way or another.