Revered photographer Mark Seliger—who’s taken iconic images of everyone from Barack Obama and the Dali Lama to Kurt Cobain and Ice T—talks about the song that he says has informed almost every photo he’s taken of his friend Willie Nelson, 1978’s “Stardust.” Mark was a college freshman on a long, lonely road trip the first time he heard it, and he describes channeling that experience, plus the work of Edward Curtis, into his first great Willie portrait nearly twenty years later. From there he gets into what you learn about Willie from a close look at Trigger, plus the wonders of playing a Fourth of July Picnic with his own country band, Rusty Truck.