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FRANCE - JANUARY 01: Johnny Hallyday And Charles Aznavour On Horseback In The 1960'S. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

FRANCE - JANUARY 01:  Johnny Hallyday And Charles Aznavour On Horseback In The 1960'S.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)