" Marie-Blanche " was the French entry in the Eurovision Song Contest 1970 , performed in French by Guy Bonnet . Bonnet had made his debut in the Contest in 1968 , when he co-wrote the lyrics to Isabelle Aubret 's " La source " . The song was performed sixth on the night ( following Belgium 's Jean Vallée with " Viens l'oublier " and preceding the United Kingdom 's Mary Hopkin with " Knock , Knock Who 's There ? " ) . At the close of voting , it had received 8 points , placing 4th in a field of 12
Eurovision Song Contest 1970
Eurovision Song Contest 1970
Marie-Blanche