The precise moment in 1968 when David Crosby, Graham Nash and Stephen Stills discovered how well their voices blended is lost in the distant heat haze of Californian hippy rock.

Some say it happened at Joni Mitchell’s house in Laurel Canyon, Los Angeles. Others claim it was at another Canyon gathering, the kind of occasion that marijuana smoke and mellow guitar jams floated out over views of the city — joined on this occasion by three male voices in perfect unison.

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