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. . THE BELGIAN COMPOSER BOUDEWIJN BUCKINX (B. 1945) WROTE NINE UNFINISHED SYMPHONIES?All were composed in a single year, 1992. . . . PLUTO HADN’T BEEN DISCOVERED YET WHEN HOLST WROTE HIS PLANETS (1914-1917)? However, later composers helped him out with a Pluto movement. In 1997 the American composer Margaret Brouwer wrote Pluto: A Sequel to Holst’s ‘Planets,’ and three years later the British composer Colin Matthews finished Holst’s cycle with Pluto, the Renewer, composed at the request of Kent Nagano. . . . THE LONGEST SYMPHONY IN THE STANDARD REPERTORY IS GUSTAV MAHLER’S THIRD? This runs about an hour and…