Yup a sad day indeed. I posted this over in the What are you listening to yesterday afternoon.
https://www.youtube.com/watch?v=kyiAPuM9cUU
Before the made it big, my younger brother saw them as an opening act for some big name band but I can't remember who it was and when they were finished and the big name came on they were boo'd and the crowd wanted more ZZTop.
Only got to see them once and that was in '90 and they used the white fuzzy guitars. It was a great show and quite a loud one at that.