Four of the 12 were doing the mileage runs. They just basically got off the plane, got their boarding pass, and got back on.

This isn't going to be a huge money maker for the company. It's more of nostalgia.

We knew that it's our roots. And we wanted to stay where our roots are.

In the Led Zeppelin shows of the Sixties and Seventies, it was the same numbers every night, but they were constantly in a state of flux. If I played something good, really substantial, I'd stick it in again.

The Yardbirds folded in 1968, and within a handful of months, Led Zeppelin was not only a band but also a very successful one.

Because Led Zeppelin weren't having to worry about doing singles, each time we went in to record, it was a body of work for an album. So you could get the shift and the movement forwards as opposed to having to be rooted back to a single that might have been done a year ago.