Hundreds of excited music fans wait in line on the lookout for their favorite singers on a hit television show. Instead of spending the time outside a New York venue or Hollywood soundstage though, these fans braved barbed wire and gun-toting guards in Kabul to attend Afghanistan’s premier pop music event: the finals of “Afghan Star,” the embattled country’s answer to “American Idol.” In line, bright mod outfits have replaced Kabul’s normally conservative dress code