1960s music icons Frank Zappa, Jim Morrison, Stephen Stills and David Crosby are the sons of high ranking military officials and each of them comes from Laurel Canyon California.
So far, nothing terribly unusual. The rest is the fodder of conspiracy theorists.
According to the theory, Laurel Canyon California is the home of a top secret Air Force Base and CIA outpost believed (By the conspiracy people) to be the birth place of the hippie movement of the late 1960d. The theory goes on to say that the CIA began the hippie subculture to distract people from the anti-Vietnam War movement using drugs and music, meaning Zappa, Morrison, Stills and Crosby were covert CIA operatives.