Jean-Fran Ã ois Le Sueur ( or Lesueur ) ( 15 February 1760 â '' 6 October 1837 ) was a French composer , best known for his oratorios and operas . Jean-Fran Ã ois Le Sueur ( or Lesueur ) ( 15 February 1760 â `` 6 October 1837 ) was a French composer , best known for his oratorios and operas .