OpenGameArt.org
Mingulay Boat Song
Credit line
"Mingulay Boat Song" by FiveBrosStopMosYT licensed CC-BY-SA 4.0: https://opengameart.org/content/mingulay-boat-song Author's attribution notice: Mingulay_Boat_Song by CambridgeBayWeather, licensed CC-by-Sa-3.0/4.0.
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.