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In page Marguerite Monnot:

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"L'Étranger" played a key role in Monnot's first encounter with Édith Piaf in 1936. Annette Lajon had sung the song originally, and Piaf wanted to acquire the rights to perform it. The publisher, Maurice Decruck, denied her request, however, because a singer had exclusive rights to a song for a six-month period,[citation needed] Piaf learned it and sang it at Le Gerny's, the nightclub where she was performing at the time. When Annette Lajon appeared in the audience at Le Gerny's one night, Piaf is said to have apologized to her for "stealing" her song. Lajon apparently accepted the apology and introduced Piaf to its composer, Marguerite Monnot, who had accompanied her to the nightclub.