Mizan | Ali Haddadi Asl: Classical vocalist and tonbak player Homayoun Shajarian, and composer Sohrab Pournazeri, are currently staging a multimedia concert titled 'Si' based on Persian poet Ferdowsi's 'Shahnameh'. The stories performed include ‘Rostam and Esfandyar’, ‘Zal and Rudabeh' and 'Rostam and Sohrab'.