In the late sixties and early seventies, an impromptu collection of musicians colonized a eucalyptus-scented canyon deep in the Hollywood Hills of Los Angeles and melded folk, rock, and savvy American pop into a sound that conquered the world as thoroughly as the songs of the Beatles and the Rolling Stones had before them. Thirty years later, the music made in Laurel Canyon continues to pour from radios, iPods, and concert stages around the world. During the canyon's golden era, the musicians who lived and worked there scored dozens of landmark hits, from "California Dreamin'" to "Suite:...