Seldom has a song had more influence than Grandola Vila Morena the signal for the Portuguese overthrow of Europe's longest fascist regime, i mentioned last week on the PI discussion of Negros Island .
Today an article on the very topic
How Portugal’s 1974 Eurovision entry toppled the country’s fascist regime | Portugal | The Guardian
Others might include the Marseillaise, Horst Wessel or Special aka Free Nelson Mandela
htts://www.youtube.com/watch?v=AgcTvoWjZJU