The advanced group of the Sistema Europe Youth Orchestra performs with a choir of children refugees living in Greece at the Odeon of Herodes Atticus in Athens, Greece, on Aug. 1, 2017. More than 421 El Sistema students of 27 nationalities from across Europe, aged from 10 to 20 years old, took part in the concert to celebrate the ability of music to unite nations, religions and cultures. (Xinhua/Marios Lolos)
