In the second part of our special series on the rivalries within the greatest supergroup in rock history, CSNY, we look at the group's original musical leader, Stephen Stills. In the early days, he took the lead in the studio, writing many of the songs and playing most of the instruments on the band's iconic 1969 debut. But Stills' hold on CSN started to slip with the addition of Y — his old friend and nemesis from Buffalo Springfield, Neil Young. While Young could exert his power often by acting in a passive-aggressive way, Stills was driven to a series of impotent power grabs, before finally faltering from alcohol and drug abuse.

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