Grateful Dead fans gather in the parking lot before a show this summer at Levi's Stadium in Santa Clara, Calif. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Dave's Picks Volume 9 features a 1974 Grateful Dead concert played in Montana. Courtesy of the artist hide caption

itoggle caption Courtesy of the artist

The Grateful Dead circa 1970. The band's members were quintessential rock hippies — but, a new exhibit reveals, savvy businessmen as well. Gems/Redferns hide caption

itoggle caption Gems/Redferns

Warren Haynes' new solo album is called Man in Motion. Steward O'Shields/Courtesy of the artist hide caption

itoggle caption Steward O'Shields/Courtesy of the artist