ZZ-Top is musical royalty here in Texas. I've seen them live about a half dozen times, and nobody does a live show any better than ZZ-Top. I saw them open for the Rolling Stones at the Cotton Bowl in October of 1981, and ZZ-Top stole the show. The Stones were great, but they were upstaged by ZZ-Top.
Check out this video, and watch how Billy and Dusty do their footwork and play to the audience. That is signature ZZ-Top.