Martinu remained in France until 1940 and began to experience increasing success. His String Quintet (1927) was awarded the Coolidge Prize; Sergey Koussevitzky programmed the jazz-influenced orchestral piece La bagarre in Boston. He wrote fifteen ballets and several operas, one of which, The Miracles of Mary (1935), won a Czech State Prize. At about this time his compositions reflected an interest in Czech folklore and history, possibly stimulated by homesickness. For example, The Miracles...