The festival has been held regularly since 1947 as an event of global youth solidarity for democracy and against war and imperialism. The largest festival was the 6th, held in 1957 in Moscow, when 34,000 young people from 131 countries attended the event. This festival also marked the international debut of the song "Moscow Nights", which subsequently went on to become a widely recognized Russian song. There were no festivals between 1962 and 1968, as events proposed in Algeria and then Ghana were cancelled due to coups and political turmoil in both countries. Until the 19th festival in Sochi, Russia in 2017 (with 185 countries participating), the largest festival by number of countries with participants was the 13th, held in 1989 in Pyongyang when 177 countries attended the event.