Robert Plant says that Pink Floyd's 2005 one-off reunion show at “Live 8” inspired him to reform with Led Zeppelin, according to Blabbermouth.net. Floyd's five-song set at London's Hyde Park marked the final time that Roger Waters, David Gilmour, Nick Mason, and the late-Richard Wright ever performed as a foursome.
Robert Plant told Planet Rock magazine, “I liked what Floyd did at 'Live 8' — a quick one-off and let's leave it at that. They did it for a good cause. It was the same when Zeppelin did the charity show for (Atlantic Records co-founder) Ahmet (Ertegun). We had a prolonged affinity with Ahmet, so if there was ever a reason for (a reunion) to happen, that was it. But the idea of doing it next summer and the summer after that and so on is enough to break me out in hives.”
Back in 2017, Plant looked back at the O2 gig, telling Rolling Stone that the 2007 reunion “. . . was magnificent. We hit a home run that night, which is something that we were really fearful of. There was probably more riding on that than we would care to believe. Our performance was crucial, but we could reproduce sound in a much more reliable way, so we could be kickass, and sound kickass. Some of those horrific gigs way back were lacking in quality.”
Robert Plant shed light on how the 2007 reunion only spurred on more desire for Zeppelin to become an ongoing matter: “In a way, obviously, it's pressure again, but it's a different kind of pressure. The last lot of pressure was, like, having the physicality and the mental capacity to be what we were many, many years ago and actually have conviction and be on it. And people can take it or leave it — but it was great, it was really good. And then you drift off and you get surrounded by this stifling industry that is: 'why don't you. . .' 'have you thought about. . . ba, ba, ba.' But when we spend time on our own, bit by bit, we become friends again.”