On the plane, an eight-year-old with an excess of testosterone keeps running across my feet. Finally I grab him by his T-shirt and say, very sweetly, 'Listen, darling, if you don't stop trampling me I'm going to make you sit on my lap while I tell you my entire life story. Including a lot of details about drug rehab and my divorce.' He goes back to his seat.

Think about all of the families where the father is a doctor and the son is a doctor or generations of coal miners. Why did they go into that line of work? Because that's what they were taught. Or was it in their genes? It's not an either/or question. It's both. I was inclined in that way. I was sensitive to music and poetry, and it was around me growing up.

Isn't that the goal, as you grow older? That you start reclaiming those parts of yourself you didn't recognize or didn't think were there all along? That's what happened when I made The River and the Thread record.

I adhere to the religion of art and music and small children.

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

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.