EDIT It's not the oldest on youtube, on reality. There's that one that I talk on the description, I just didn't find. I apologize.
An recording of the famous communist song The Internationale (L'Internationale) done by Henri Weber in 1907. As far as I know, it's the oldest disponible recording of the song. Apparently, there is an 5 years older recording of the same author, but this one I didn't find. I'll update this description if I find this older one later.
Sorry for the quality of the image, apparently it's the only image of the recording on the internet.
I didn't digitalized this, I'm just posting on Youtube once I couldn't find it on this site.

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