This was one of the best things about Lennon and McCartney, the competitive element within the team. It was great. But hard to live with.

I'm not a great practiser at all. We were never great practisers. The Beatles would come together for about a day before we had a tour, to make sure the amp worked.

Some people want to fill the world with silly love songs

I think a domestic situation can change you and your attitudes. I suppose if you did get a bit content, then you might not write savage lyrics.

If anyone wants to save the planet, all they have to do is just stop eating meat. That's the single most important thing you could do. It's staggering when you think about it. Vegetarianism takes care of so many things in one shot: ecology, famine, cruelty.

I'm mad, you know? I don't think of retiring at all.

Being in the audience actually looks like quite a lot of fun.