David Crosby, one of the most iconic and enduring voices of the nineteen-sixties, died last week, at the age of eighty-one. He was a founding member of the Byrds and of Crosby, Stills, and Nash (sometimes Crosby, Stills, Nash, and Young), two deeply beloved and influential folk-rock outfits. For anyone who found solace or haven in Crosby’s singing, his death feels like the dimming of some golden light.