Peshawar (Pakistan) (AFP) – For years the distinctive twang of Pashtun music was drowned out by rattling gunfire and deafening explosions as musicians in Pakistan’s northwest were targeted by militants. But, as security improves, a centuries-old tribal tradition is staging a comeback.Performances that once took place in secret are returning. Shops selling instruments are open and thriving again, while local broadcasters frequently feature rising Pashto pop singers in their programming. And new, up and coming bands like Peshawar’s Khumariyaan have reached rare, nationwide acclaim after appearin…