The query references a "Secret commercial" and a French song, but no specific commercial, brand, or song is identified in the provided context. "Secret" could refer to:
Without the year, market, product line, or audio/video reference, the lyrics cannot be retrieved. French songs in ads are often licensed snippets (e.g., Françoise Hardy, Serge Gainsbourg, Christine and the Queens, Stromae, Zaz, Édith Piaf) or custom compositions.
Provide more details (brand, year, visual description, any remembered lyrics) for a precise answer.