The titans of ’90s Britpop walk the earth once again, and sometimes they even play shows in America. Supergrass, for instance, are over here playing shows. Their peers in Oasis and Pulp are doing the same thing, but they’re not giving performances on American late-night TV like Supergrass. The Oxford band released their nervy, punky debut album I Should Coco in 1995, and they’re currently celebrating that album’s 30th anniversary on tour. On Thursday night, the band did musical-guest duty on Jimmy Kimmel Live, and they busted out an I Should Coco deep cut.