Audience view the main concert held under the arch of Tartu Song Festival Grounds in Tartu, Estonia, June 22, 2019. The three-day celebration of the 150th anniversary of Estonia's Tartu Song Festival at its birthplace climaxed with the procession of singers and musicians and the main concert at the Song Festival Grounds in Estonia's second largest city of Tartu on Saturday. (Xinhua/Guo Chunju)