When Nick Cave was in his early band The Birthday Party, he was angry and antagonistic toward his audience. The legendary Australian musician, writer and actor eventually grew out of his youthful contempt, but he remained consumed by his work, always putting it first before anything else. Then he lost two of his sons. In this wide-ranging conversation about grief, ambition, God and Johnny Cash, Nick tells Tom Power how he was forever transformed by his experience of unimaginable loss. He also discusses his new Nick Cave and the Bad Seeds album, “Wild God,” and the mysterious origins of his songwriting.