Jaques Dutronc - "L'opportuniste"
The song is a sharp, political satire written in the immediate aftermath of the May 1968 civil unrest in France.
The narrator proudly proclaims to have no real political ideology. He supports communism, socialism, and capitalism all at once, shifting his stance based purely on personal gain. The central punchline revolves around the famous French idiom "retourner sa veste" (to turn one's coat/jacket inside out), which means to change sides or be a turncoat.