PHOTOGRAPHER HENRY DILTZ SNAPPED THE COVER shot of Dan Fogelberg’s 1974 album Souvenirs in the living room of art designer Gary Burden’s Topanga Canyon, Calif., home. “Gary collected Indian artifacts, and among them was that eagle feather,” recalls Diltz. “Dan picked it up, and that looked so great it became the album cover. There was such an intensity to the way he was looking at the camera. It had an ancient quality to it.” The sepia...