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I get this Belgian Knorr ad for some kind of "champignon soup" very often on Youtube, and the song in it sounds quite familiar.
I couldn't find the actual ad that they show before videos, but this is something slightly longer and with the same song.

Sorry about the monologue in Dutch...
I think the song may be the instrumental version of something I've heard, or maybe I'm wrong and it was just made for the ad.