Saudi Arabian singer Mohammed Abdu peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128GC

Saudi Arabian singer Rashed Al-Majed peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128FO

Saudi Arabian singer Rashed Al-Majed peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128FR

Saudi Arabian singer Rashed Al-Majed waves as he peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128FT

Saudi Arabian singer Rashed Al-Majed peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128FL

Saudi Arabian singer Mohammed Abdu peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128G5

Spectators take pictures during a concert by Saudi Arabian singers Mohammed Abdu and Rashed Al-Majed in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128F8

Saudi Arabian singer Mohammed Abdu peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128GB

Saudi Arabian singer Rashed Al-Majed peforms during a concert in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128F9

Spectators take pictures during a concert by Saudi Arabian singers Mohammed Abdu and Rashed Al-Majed in Riyadh, Saudi Arabia, March 9, 2017. Picture taken March 9, 2017. REUTERS/Faisal Al Nasser - RTS128FQ