Happy songs are very difficult to write. How many truly great upbeat songs are there?

I like singer-songwriters, and I find sad songs comforting rather than depressing. It makes you realise you're not alone in the world.

I seem to have very polite fans, not fanatical ones.

It's much easier to write when you're sad. But you can end up isolated and depressed because you almost need to put yourself in that situation to have that angst to write from.

My kitchen bench is covered with vitamins and protein powders. I go through phases when I'm sure I'm taking too many - but I don't get sick often.

I would have been happy to have waited till I was in my mid- to late-30s before I got married, but you don't choose when these things happen, and when they do, there's no doubt in your mind.