I saw Zep right about the time of this album-—the black “Icarus” t-shirt, which I had until the 1990s.
They. Were. Terrible. Plant couldn’t hit any high notes, Page was so drunk he couldn’t even cross his legs when he sat down. Bonham & Jones just a dull roar.
My singer, at the time, went as well and I didn’t know he was there. Later we touched base. He said the same thing. Worst concert he ever saw.
Which is why Peter Grant assaulted Grand Funk Railroad’s manager, threatening him if they didn’t pull out as Zep’s opening act, because they were blowing Zep off the stage.