I wanted to emulate music from America - young punks playing rock n' roll is what it was. I read part of Keith Richards' autobiography, and it was totally parallel with me, learning from American records.

There's such a currency to Led Zeppelin, or the members of Led Zeppelin. If I put it to you this way, on the run-up to the O2 concert, the only music that we played was music of Led Zeppelin - the past catalog stuff; that's what we played on the way towards shaping up the set list for that. But we played really, really well.

You get a chance like that maybe once in your lifetime, and you are lucky to sustain it over that period of time. It doesn't mean to say that whatever I do in the future has no substance to it - I may present some new material I've got, and there are definitely new angles of doing it - but I'm not looking to recreate another Led Zeppelin.

My vocation is more in composition really than anything else - building up harmonies using the guitar, orchestrating the guitar like an army, a guitar army.

Writing has certain advantages; film is another way to tell a story. An experienced filmmaker will take what she needs from the book and leave out other things. With adaptations, you never get the texture of the writing: it's a different mode.

Science fiction is my way of pushing the imagination onward. It's a way to understand how the world will look in the future.

Certainly I was a very religious child, a deeply weird and very emotional child, an only child with lots of imaginary friends and a very active imagination. I loved Sunday school and Bible camp and all that. I had my own white Bible with Jesus' words printed in red in the text; I even spoke at youth revivals.

When I hear stories about the number of kids that have been lost to violence, where families grow up teaching kids 'duck and cover' long before they learn their ABC's or their colors, I know there is something profoundly wrong in our city.