(Guillaume) Guy Lacour (born 8 June 1932 in Soissons, Aisne, died 15 May 2013) was a French composer of classical music, and a tenor saxophonist.Lacour started musical studies at 10 years old in his home city of Soissons. He joined local orchestras and earned his diploma from the Confédération Musicale de France. He then attended the conservatory in Versailles where he studied with Marcel Josse. He entered the Conservatoire National Supérieur de Musique in Paris in 1950 and studied saxophone with Marcel Mule and chamber music with Fernand Oubradous.