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31st December 1769: The end of a letter from German composer Christopher Willibald Gluck (1714 - 1787) to Prince Kaunitz. It reads : 'I humbly request that my prayer may be heard, and remain with the profoundest respect your Serene Highness' Humble and Obedient Servant, Christopher Gluck. Vienna 31 December 1769'. (Photo by Hulton Archive/Getty Images)