Il était une fois was a popular French musical group fronted by Joëlle Mogensen as lead vocals. Formed in Paris in 1972, it included besides Mogensen, Serge Koolenn, Richard Dewitte, Lionel Gaillardin, Bruno Walker and Christian Burguière. Walker and Burguière were later replaced by Jean-Louis Dronne and Daniel Schnitzer. The band was signed to the Pathé Marconi label.