Lance,
That was the one I saw....I know it was the early 70's...The first Zepplin one was when they openned up for the WHO....gezzzzz the drugs sure took it's toll.....had to call my brother and get it right....as soon as I read ZZ Top it rang one of few reamning bells in my noggin'..wasn't that one strange concert?....Never was a Heep fan much less a EW&F fan...71' 72' maybe?