New answers tagged origine-ou-raison
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Générique relates to genre and specially engendrer and lists all the people who generated (gave birth to) a movie, its géniteurs or générateurs. The word is attested in the early fifties and started to be popular in the sixties.
As Circeus commented, using générique for a theme song came later by metonymy.
Google Ngram:
Source: Émile Moussat, Ce que parler ...
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