OpenGameArt.org
game847-soundloops
Credit line
"game847-soundloops" by boite obscure licensed CC-BY 4.0: https://opengameart.org/content/game847-soundloops Author's attribution notice: if you use these file, please mention my real name or my nickname "boite obscure"
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.