David Crosby, the kind of singer-songwriter who made the 1960s feel both smarter and more combustible, hit first as a key voice in The Byrds in the mid-60s, where folk-rock got electrified and suddenly sounded like the future. After that, I watched him pivot into Crosby, Stills & Nash from 1968 onward, turning harmony into a weapon and a comfort blanket at the same time, then kick the whole thing wider with Crosby, Stills, Nash & Young starting in 1969, when the songs got longer, the stakes got heavier, and the era started leaving fingerprints on every chorus. Reunions kept flaring up through the 70s and later decades, because some chemistry refuses to stay dead. David Crosby Wiki