I know we've seen links on the Ledge to ZZ Top performing "Oh Well" but can't see that a link has been posted to this one of "Rattlesnake Shake". Apparently from a show from their earlier years - from a quick search on the web, it looks like this was a regular in their setlist in 1971 and 1972.
https://www.youtube.com/watch?v=_ZMfU5t_5eY