Rengaine translates to "refrain" or "old tune," but it often has a more specific meaning. It describes a phrase or melody that is repeated so often it becomes tiresome, like an old song you can't get out of your head.
In the song, Céline Dion sings about "sa rengaine insolente" (its insolent refrain). She uses this word to personify the stubborn, repeating voice of her inner child, which powerfully illustrates the song's theme: you can't escape who you truly are.
Have you ever looked in the mirror as an adult and realized you are still that awkward kid from middle school? That is the whole point of Céline Dion's "On Ne Change Pas" [We Don't Change]. She insists that growing up is mostly just theater: "On met juste les costumes d'autres sur soi" [We just put on other people's costumes] and strike defensive poses. She uses the everyday French idiom "se donner le change" [to fool oneself or keep up appearances], showing how we fool ourselves into believing we make completely free choices. Scratch beneath the surface, and that vulnerable child is still there, stubbornly humming "Ne me quitte pas" [Don't leave me] like an insolent catchphrase.
What makes this track hit so hard is how personal she gets. Céline points directly to her hometown in Quebec with the line: "Une petite fille maigre / Marche à Charlemagne, inquiète" [A skinny little girl / Walks in Charlemagne, anxious]. No matter the world tours or glamorous clothes, she still sees that lonely girl walking through the Canadian snow, ignoring the freezing cold. She even jokes that when she applies makeup ("Si je la maquille"), that younger self fades for a second just to watch her and laugh. It is an honest, witty reminder that titles and suits—whether you end up as a prince or a servant ("Un prince, un valet")—never truly erase where you started.