And he says the resulting products were principally conceived by himself and Q Prime Management partner Cliff Burnstein. Led Zep gathered for the one-off Celebration Day concert in 2007, but the recording remained unreleased for five years after singer Robert Plant refused to take part in any further reunion shows.

Mensch says that the DVD, along with the Led Zep archive box sets which arrived between 2014 and 2015, were only approved after he'd taken a supervising role.

He tells Billboard: "The backstory on Celebration Day is that it wasn't coming out because they were fighting internally. Jimmy called me up and asked me to come back to solve the problems. It had been five years since I was last on the case. Celebration Day was all us, and those box sets were mostly Cliff's and my idea. They're structured the way I wanted them structured."

One moment in the process remains a career highlight for Mensch, while Celebration Day was being produced: "Jimmy needed someone to mix the record, so I brought in Alan Moulder. I'm watching Jimmy Page miming Kashmir as Moulder is putting the final touches on it. And that, for me, was like, 'F*** me!'" Read more - here.

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