There's so many different ways humans have used music to express the spiritual part of our nature and to connect us with the divine. So for me the pathway is through music.

I have to say what I do is not easy and there are definitely moments where I feel inadequate to the tasks I've set for myself. And that's hard to feel - like you're giving your life to something and you can't really do it as well as you want to do it.

Being an artist is not exactly the most universally respected, or secure thing to do with your life. It can be frightening and you can feel that you're taking a lot of risks just with your own life, and your family's security. But the rewards outweigh those things.

I do think that it's a challenge for me or for anybody who has had certain iconic things happen to them in their career to re-engage people and say that there's still more to discover. And also to have that confidence in yourself that you still have more to bring.

With me, it's so eclectic and all over the map that no one knows what to expect, ... It may not be a great career move, but all these things - singing with the Funk Brothers and the Dead, singing a Dolly Parton song - is great. I'm welcome to all these different worlds, and that's been wonderful.

How long have you been sitting in the darkness? You forget. You know you're getting hard to be with and you're crying every time you turn around. Oh my crazy baby, try to hold on tight. Oh my crazy baby, don't put out the light. And your hands are shaking something awful as your worries crawl around inside your clothes.

It's very reassuring and spiritual to be connected with something larger than yourself and the inside of your own head.