PHOENIX – The accordion, bass guitar and percussion harmonize seamlessly in the energetic beat of Grupo Frontera and Bad Bunny’s chart-topping corrido, “Un X100TO.” Amid the easygoing, upbeat music, the enticing sweet and salty aroma of sizzling bacon and onions from Sergio Vargas’ pushcart stovetop permeates the air of the intersection where he meticulously assembles […]