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More than 1,000 music-lovers showed up on Saturday, July 5, in a German town to hear a change of note in the longest-running and slowest piece of music ever composed. Eccentric US composer John Cage (1912-1992) planned his composition to last 639 years, meaning more than a dozen generations of musicians will be needed to play it on an automatic, as-yet unfinished organ at Halberstadt, Germany.