Jan Ekier ( 29 August 1913 -- 15 August 2014 ) was a Polish pianist and composer known for his authoritative edition of Chopin 's music for the Polish National Edition .
Jan Ekier ( August 29 , 1913 -- August 15 , 2014 ) was a Polish pianist and composer . He is known for his authoritative edition of Chopin 's music for the Polish National Edition .