 Three opening acts played before U2 , beginning with the Gazi <unk> @-@ <unk> choir , an Islamic choir from a local high school . Their performance was followed by two local bands , <unk> and <unk> , one of which was chosen personally by Sacirbey , and the other which was selected through a radio contest . Following the opening acts , musician <unk> B performed a DJ set before U2 took the stage . 
