OpenGameArt.org
Exiled Soul
Credit line
"Exiled Soul" by Gundatsch licensed CC-BY 3.0: https://opengameart.org/content/exiled-soul Author's attribution notice: Gundatsch - https://soundcloud.com/gundatsch
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.