Fifty years ago, the original members of the Grateful Dead stepped onstage for their first show at a Menlo Park pizza shop. It marked the birth of a band that would define the hippie culture of the 1960s and earn what many consider the most loyal fans of any rock band in history. In his new book, "No Simple Highway: A Cultural History of the Grateful Dead," author Peter Richardson examines the band's utopian ideals and lasting appeal.