The Spectrum in Philadelphia was the Dead’s kinda zoo, where they played 55 times between their 1968 debut and their last shows in 1995, more than any other act. This became an annual tradition that starting in spring ’77, cemented the following May. “The Music Never Stopped” was never more apt than as a description of the Dead and Heads’ northeast travels that spring, which featured crisscrossing tours by the Bob Weir Band, Robert Hunter and Comfort, and the Jerry Garcia Band, who appeared at the Spectrum’s adjacent theater in March. Only three years old (and less than two years since the band’s return to the road), it sounds like a theme song played as a first-set closer.