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In page Christmas Eve/Sarajevo 12/24:

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The story is a slightly altered version of the real-life story of Vedran Smailović. Smailovic was in reality 36 years old during his 22-day vigil, during which he played Remo Giazotto's Adagio in G minor each day among the bombed ruins of Sarajevo in honor of each person killed in the bombing. He was not the only cellist who played through the siege; the Sarajevo String Quartet, which did have elderly members, were also noted for their continuous performances throughout the siege.[2]