The story of "the Black Mozart," Joseph Bologne, Chevalier de Saint-Georges, comes from France, but befits Black History Month. The son of a French colonial plantation owner and an African slave, he was the best fencer in Europe and a major composer of the Classical music era. His works influenced Mozart. During the French Revolution, he was active in France and England concerning the abolition of slavery. This weekend, the Chicago Symphony Orchestra Association and Music of the Baroque are cooperating in a concert theater production about his life, "The Chevalier."