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In page Marguerite Monnot:

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She was classically trained by her father and at the Paris Conservatory (her teachers included Nadia Boulanger, Vincent d’Indy, and Alfred Cortot). Monnot made the unusual switch to composing popular music after poor health ended her career as a concert pianist at the age of eighteen. Soon after, she wrote her first commercially successful song, "L'Étranger". In 1935, she met Édith Piaf, and in 1940, they became a female songwriting team, remaining friends and collaborators throughout most of their lives.[citation needed]