there is plenty about Ca Ira on Wikipedia, which I have shared to a new thread. Some versions of the song, both French and English language, are provocative and gory.

And tes tgere was a previous Mudcat discussion. https://mudcat.org/thread.cfm?threadid=38012 asks for songs to the tune The Downfall of Paris.

I would not think of the tune as I know it when I listen to the Edith Piaf recording. Or this recording (also with a set of lyrics in the notes)

https://www.youtube.com/watch?v=-srLjMRjoVI

instrumental by the Yorkshire regiment

There is just a bit of similarity at the beginning of the tune. To me, I am not speaking of the same air when I say Ca Ira as when I say or play The Downfall of Paris.

Downfall of Paris, Irish dance tune https://www.youtube.com/watch?v=vuljlIwx638 played by the Davey Triplets (lol)