Compositions   1937: Piano Sonata No 1 1939: Concerto for Double String Orchestra 1939: A Child of Our Time 1944: Symphony No 1 1952: The Midsummer Marriage 1957: Symphony No 2 1958: King Priam 1962: Piano Sonata No 2 1970: The Knot Garden 1970: Symphony No 3 1973: Piano Sonata No 3 1976: Symphony No 4 1983: The Mask of Time	World Politics 1929: Wall Street Crash   1939: Second World War     1949: Mao declares Chinese Republic     1961: Berlin Wall built       1975: End of Vietnam War