Omar Souleyman, a 49-year-old farmer-turned-wedding-singer from north-eastern Syria and a father of 9, is an unlikely electronic music star. This month he drew big crowds to KOKO, one of London’s most iconic music venues. Donning the jalabiya andkeffiyeh, traditional Arab garments, along with his signature aviator shades, he performed to a packed out venue full of white middle-class youth.