I sort of have various sort of theories when people ask me about songwriting because it is a mystery. You don't really know. Sometimes you can do it and sometimes you can't. It's really peculiar.

When I find a cover song that I like, I'll work away at it until I kind of believe that I wrote it.

If a hit came along, I wouldn't be unhappy about that. But I'm a bit too old for that now-doing videos and all those types of TV shows. I've kind of done all that, in the '70s.

I'm very interested in religion and different religions, and I know quite a lot about it. I love gospel music, and I love going to churches, but the one drawback is that I don't actually believe in God. And it is quite a handicap, you know.

And then, one day, they program a new tune, and it really catches your ear, you know, because you can be doing the washing up or something, you know, in your apartment and suddenly you go, whoa, what are they playing in there? And you run to the wall, but it's finished - but the song's finished. You only heard enough of it just the pique your interest. And you never know when they're going to play it again, of course, like a normal radio station.

I found myself in Zurich Airport. I'd done a TV show, oddly enough, with Mavis Staples. That's the way they do it in Switzerland. And I'd had a bit of a late night with members of her band. And I was - my flight was delayed. And I was sitting in the airport, and I just came up with the idea. And by the time, we landed at Heathrow, I'd pretty much sort of got it.

But anyway, I was convinced that it would go away, you know. But the idea was that he was sitting on a flight - you know, one of those sort of fairly long flights, like, sort of, you know, Newark to Denver or something like that - so, you know, a few hours.