B efore our interview begins, Milton de la Rosa — one of the vocalists in the Mexican band Latin Mafia — is busy playing the harmonica. “It’s crazy. It’s relatively simple until it isn’t. Playing clean notes is hard. We’re working on that right now,” he says as his twin brother Emilio and his older brother Mike arrive. Latin Mafia, made up of the trio of brothers, just arrived from a trip to Paris, capping off an intense year that shot them to the top of the Latin music scene. During a rare