The real-life inspiration behind the hit television series The Partridge Family, the Cowsills -- comprised of teen siblings Bill, Bob, Barry, John, Susan, and Paul in tandem with mother Barbara -- were one of the biggest pop acts of the late '60s, scoring a series of hits including "The Rain, the Park and Other Things" and "Hair" with their angelic harmonies and sun-kissed melodies. The group's origins lie with Bill and Bob, who as children began their singing careers covering Everly Brothers hits. Given guitars by their father, Navy man William "Bud" Cowsill, the siblings soo...