[dfwgator]

In fact, we weren’t even going to see Yes, but our jaws dropped. Black Sabbath came out and were like infants compared to the musicianship that had just left the stage.

Same happened when Van Halen opened for Sabbath. This is why Peter Grant decided Zeppelin wouldn't have any acts opening for them, after Grand Funk Railroad blew them off the stage.

[LS]

Mark Stein of Vanilla Fudge told me that they and Zep toured around 1969-70. For the first time he could remember anywhere, the bands traded off leading act status based on who had the top album in the location they were playing.