OpenGameArt.org
RPG - Underworld Theme - Loop
Credit line
"RPG - Underworld Theme - Loop" by jocolloman licensed CC-BY 4.0: https://opengameart.org/content/rpg-underworld-theme-loop Author's attribution notice: Copyright 2021 Joseph Collard
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.