In March, the Squirrel Nut Zippers released Beasts of Burgundy. Recorded in New Orleans at the Marigny studio owned by producer-engineer Mike Napolitano and Ani DiFranco, it’s the band’s first album in 18 years. The return of the Squirrel Nut Zippers, said the band’s leader, Jimbo Mathus, isn’t a reunion—it’s a revival.