When the first bombs rang out in Sudan, Amjad, Fatima and Mazin abandoned their paintbrushes, musical instruments and studios, leaving behind the lives they knew for unfamiliar shores. Now in Egypt, they have sought to bring back the sights and sounds of a long-lost home to an audience of about a hundred, just a stone’s throw away from Cairo’s iconic Tahrir Square. Mazin Hamid, a celebrity in his native Khartoum, thrilled the crowd with his homegrown beats at a concert accompanying an exhibition. When war broke out in his home country last April, Hamid was under a tight deadline to produce the…