I always felt if we were going in to do an album, there should already be a lot of structure already made up so we could get on with that and see what else happened.

The album's not dead for me; I still buy vinyl albums.

The passing of John Bonham... Let's just put it... Before we say, 'the passing of John Bonham,' the introduction of John Bonham on the first album and 'Good Times Bad Times,' it changes drumming overnight.

The fourth album encapsulated some remarkable music that was really groundbreaking. We were able to have something like 'When the Levee Breaks,' which, sonically, was very menacing. But then you had the flip side: something like 'Going to California,' which is really intimate.

We were lucky in the days of Led Zeppelin. Each album was different. We didn't have to continue a formula or produce a certain number of singles. Because, in those days, radio was still playing albums. That was really good.

From the first album, Led Zeppelin was always going to be a totally new approach from what had gone before - whether it was approaching the blues or folk music like 'Babe I'm Gonna Leave You': nothing existed like that.