I was a freshman at UT Austin 1968-69. ZZ Top, under that name, played the New Orleans Club on San Jacinto Avenue around Feb '69. Billy, Frank and Dusty were the band. That's the first time I heard them, and you immediately knew they had something special. They played the old Peter Green/Fleetwood Mac song "Rattlesnake Shake". Billy used his '59 Les Paul, Pearly Gates, and played thru a half stack Marshall with an overdrive boost.Two months later, April '69, I bought their first album at a recored store in Austin. And they had been playing under the name "ZZ Top" at frat parties before that. So I'm not clear about the timeline posted elsewhere on this blog that talks about how ZZ didn't form until Oct '69. Maybe that's when they made it official, but they were playing under the ZZ name months before that.