Ai Weiwei holds piano performance at Greek border Chinese dissident artist Ai Weiwei organizes a piano performance on the Greek-Macedonian border, where some 12,000 refugees and migrants stuck in grim conditions. Nour Alkhzam, 24, a Syrian who has not seen her husband for a year and a half, played for 20 minutes on a white piano in a bleak rain-soaked field. IMAGES AND SOUNDBITES