"We're Bleachers from New Jersey!" shouted frontman Jack Antonoff. At Coachella on Friday, the singer-guitarist stepped out looking less the precocious pop artist of fun. than working class Jersey boy in sleeveless T-shirt and black cap. The band's 11-song set was relentlessly upbeat, even when exploring romantic challenges through pop songs of deep feeling and hard questions. He unfurled a swirling guitar solo on "Wild Heart," and brought out Carly Rae Jepsen for "Hate That You Know Me" and a partly acoustic "Alfie's Song (Not So Typical Love Song)." By the time Antonoff demanded that fans climb on each other's shoulders to "make it a real fucking festival," the crowd was bouncing along.