Gilles Binchois ( probably born in Mons about 1400 ; died Soignies , 20 September ,1460 ) , was a Franco-Flemish composer . Gilles de Binche ( called Binchois ) , also known as Gilles de Bins ( c. 1400 â `` 20 September 1460 ) , was a Franco-Flemish composer , one of the earliest members of the Burgundian School , and one of the three most famous composers of the early 15th century .