Dumont is best remembered for writing or co-writing more than 30 of the most well-known songs recorded by singer Édith Piaf, including "Non, je ne regrette rien".

That led to more than 30 songs for her, such as "Flonflons du Bal", "Mon Dieu" and "Les Amants", which Piaf and Dumont wrote and sang together in 1962.

[2] Dumont tells in the book Édith Piaf, Opinions publiques, by Bernard Marchois (1995), that Michel Vaucaire's original title was "Non, je ne trouverai rien" (No, I will not find anything) and that the song was meant for the French singer Rosalie Dubois [fr].

[4] According to journalist Jean Noli, in his book Édith (1973), when Charles Dumont and Michel Vaucaire visited Piaf's home at Boulevard Lannes in Paris, on 24 October 1960, she received them in a very impolite and unfriendly manner.

[6] At the time of the recording, France was engaged in a military conflict, the Algerian War (1954–1962), and the 1st REP (1st Foreign Parachute Regiment)—which backed the failed 1961 putsch against president Charles de Gaulle and the civilian leadership of Algeria—adopted the song when their resistance was broken.

[9] He and Vaucaire wrote a song about the Berlin Wall, which had just gone up, called "Le mur", intended for Piaf.

[10] In 1966, Streisand released her eighth album, Je m'appelle Barbra, with "Le mur" on it, sung all in French.

[12][13] In the 1970s, Dumont started a career as interpreter with songs such as "Une chanson"' (1976) and "Les amours impossibles" (1978).