Chord substitutions are one of the most powerful tools a jazz guitarist has. The concept is straightforward: you replace an expected chord with a different one....
Intervals of thirds are one of the most powerful tools in funk rhythm guitar. They sit in a sweet spot: fuller than a single note, but lighter and more mobile than a full chord voicing....
BB King's vocal phrasing is the key to his blues guitar phrasing. Mike Welch understood this early, and it changed everything about how he approached BB's style....