Here are links to my articles about the musical score of the Marseillaise having been taken by Rouget De L’Isle from the Italian Giambattista Viotti, when he composed the famous song which is today the French National Anthem.

http://www.opednews.com/articles/Who-composed-the-Marseilla-by-Angelo-Paratico-Modernity-160119-126.html

Here is the original music by Viotti written long before the Marseillaise:

-In Italian on 20/01/2016 and published on the blog La Nostra Storia by Dino Messina, Corriere della Sera:

Il lungo cammino della Marsigliese, che aveva un padre italiano…

-And on the l’Italiano:

http://www.litaliano.it/index.php/cultura/notizie/1500-la-marsigliese-ha-origini-italiane