Yes, I know that Billy Gibbons' guitar parts on Just Got Paid were overdubbed. I'm sure he played the rhythm part first, then recorded the lead part over it.
I didn't mean to suggest that he played both parts at the same time. My point was that it's a measure of his ability that he was able to play both parts so well.
According to Wikipedia, the ZZ Top lineup of Gibbons, Dusty Hill and Frank Beard played their first gig together at a Knights of Columbus hall in Beaumont, Texas. Talk about humble beginnings.
A lawyer who likes to write music commentary.