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He wrote songs until the 1960s, sometimes under an alias, for Dalida, Gloria Lasso, Luis Mariano and Tino Rossi. He worked with lyricist Michel Vaucaire. In 1956 they wrote Non, je ne regrette rien, recorded in 1960 by Édith Piaf. 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.
Piaf's death in 1963 led him to work with Jacques Brel, writing Je m'en remets à toi in 1964, and to writing songs for television shows such as Michel Vaillant in 1967, and cinema, Trafic by Jacques Tati in 1971. That same year he placed a song with Barbra Streisand, who bought Le Mur, which became a hit as I've Been Here (on the album Je m'appelle Barbra)
In the 1970s Charles Dumont started a career as interpreter with songs such as Une chanson (1976) and Les amours impossibles (1978), which received awards.