When I was 18 years old, I went on the road with my dad after I graduated from high school. And we were riding on the tour bus one day, kind of rolling through the South, and he mentioned a song. We started talking about songs, and he mentioned one, and I said I don't know that one. And he mentioned another. I said I don't know that one either, Dad, and he became very alarmed that I didn't know what he considered my own musical genealogy.

My dad [Johnny Cash] went to the [Richard] Nixon White House and refused to sing "Welfare Cadillac" (instead performing the anti-war songs "The Ballad of Ira Hayes" and "Man in Black"). He protested the Vietnam War, but he went to perform for the troops with bombs dropping all around him. He had that kind of genius: a true artist's capacity for holding two opposing thoughts at once while being large enough to encompass all realities.

I gave up language for a while, and I started painting.And then I only listened to Miles Davis and other instrumental music to see how it felt to be without words.

I love mixing up my genres.

I wanted to be the writer in the room setting depth charges of feeling out the world with my language.You know, I had a very romantic idea about that.But I grew into being a performer.

Celtic music is part of the language in Scotland and Ireland, where every kid and grandparent knows those songs, music by the likes of Woody Guthrie and Hank Snow is getting entrenched here. They are part of our cultural language. It's part of a living treasure. It doesn't just belong to a museum.

I'm not the type to turn to drugs and alcohol, but I do have a profound devotion to art and music - and children.