CAKE Two decades after forming as a “convulsive gesture,” an alt-rock stalwart doesn’t look back Cake frontman John McCrea isn’t given to retrospective analysis of how he, his music or his band has evolved over the past 20 years. “I feel strongly that the song should be its own universe,” he says. McCrea sees no need to find the threads that tie together either the band’s career or its new album, Showroom of Compassion. Fair enough....