Crosby, Stills & Nash's eponymous debut album marks the point where rock music transitions from the heady explorations of the 1960s into the burnished self-reflections of the '70s. Upon its release in 1969, the album ushered in a new era, one where revolutions turned inward as the music got quieter and softer, creating a soundtrack for a generation easing into adulthood. Maturation looms large in the collective work of , , and , who were occasionally joined by ' former bandmate , who was added to help fill out the band's sound as they headed out on tour that wound up shattering all previous records for ticket sales. CSN(&Y) made music for grown-ups during their '70s heyday, an aesthetic that eventually evolved from folk-rock into adult contemporary pop in the '80s. The transition wasn't necessarily smooth. The members often quarreled, splitting into side projects -- worked as a duo for a while, led a band called for a spell in the '70s -- but Crosby, Stills & Nash always reunited (sometimes with the assistance of ), as the chemistry and cultural impact they had as a group proved to hard to resist.