Product Group: Piano Solo. Contributor: Addinsell, Richard. The Warsaw Concerto was written by British composer Richard Addinsell for the 1941 film, Dangerous Moonlight (also known under the later re-title Suicide Squadron). The film's love-story plot revolves around the fictional composer of the piece, a piano virtuoso and "shell-shocked" combat pilot, who is a refugee in England from the World War II occupation of Poland and considers returning to Poland to rejoin the war.