Certainly, as a guitarist, I was aware of descending chromatic lines and arpeggios long before 1968.

I consider descending chromatic lines and arpeggiated chords basic skills learned by any student of the guitar.

Every musician wants to do something which will hold up for a long time, and I guess we did it with 'Stairway to Heaven.'

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.

If I pick up a guitar, I don't practise scales. I never have. I come up with something I haven't done before, new approaches to chord sequences, riffs, rhythms, so it becomes composition. It's not like the music I'm doing is just a single thread.

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.