Yea I tried like 5 or 6.. But they didn't even find other song that I know, when I tried it so... they are probably mostly usable for music with lyrics, or popular songs.
I even tried to upload it to youtube but they said there are no copyright claims :/
I will not give up tho... I think it's rather non-copyrighted music than OC
EDIT: ok got it, it's music published for OGA 2020 October Art Challenge "Urban Legends" - https://opengameart.org/content/ghost-town (if someone would be obssessed as well lol)
Anyhoo it was not used in the other post-apocaltyptic game as I thought, so I was mistaken. At least I can go sleep with peace of mind, now that I found it xD