The two most important American rock bands performing at the Monterey International Pop Festival—Buffalo Springfield and The Byrds—had one thing in common: David Crosby. These sets mark a pivotal moment in Crosby’s career: One of his final performances before leaving The Byrds and, sitting in with Buffalo Springfield at the request of Stephen Stills, the beginnings of the partnership that would become Crosby, Stills, and Nash. While the sets by Otis, The Who, Janis Joplin, and Jimi Hendrix were revolutionary moments, these sets by The Byrds and Buffalo Springfield tell a different story, of one artist’s evolution that in turn changed rock music itself.