This is true - I was there. Just as Zep Head has it above (from the Steve Hoffman Forum), posted in Feb 1 2012. This is a great story for me personally because I'd recently seen a group called The Pack at the Grand Haven (MI) Roller Rink and Ballroom (if you can believe it ... was it just the summer before? that's a bit misty for me). Then here was this band opening for Zeppelin - and it was them, The Pack. Now called Grand Funk Railroad. And they were -- GREAT. Shockingly so to the audience, which was getting increasingly enthralled, excited, charged up. Farner was great, the songs very cool, you name it. Then, suddenly, in the middle of a song -- the Zep manager suddenly pulled the plug on them -- and we in the audience all took it as pettiness, jealousy, pure and simple. Was the audience ever pissed -- beyond pissed. Lots of booing, as you can imagine. Then, after a long wait, Zeppelin came out -- and they were very average. Especially compared to Grand Funk on that night. Especially Page - he was not on his game. I'd seen them before, at the Grande in Detroit (and I saw them again) - but on this night they were just very uninspired. Was there more booing -- you better believe it. It was a hostile evening -- memorably so. It was the hostility that was memorable -- and GFR.