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"Sound—both music and effects—performs important functions in the movie. Indigenous Algerian drumming, rather than dialogue, is heard during a scene in which female FLN militants prepare for a bombing. In addition, Pontecorvo used the sounds of gunfire, helicopters and truck engines to symbolize the French methods of battle, while bomb blasts, ululation, wailing and chanting symbolize the Algerian methods. Gillo Pontecorvo wrote the music for The Battle of Algiers, but because he was classified as a "melodist-composer" in Italy, he was required to work with another composer as well; his good friend Ennio Morricone collaborated with him. The solo military drum, which is heard throughout the film, is played by the famous Italian drummer Pierino Munari."

https://en.wikipedia.org/wiki/The_Battle_of_Algiers#cite_note-18