OpenGameArt.org
Elegh Epic Soundtrack
Credit line
"Elegh Epic Soundtrack" by Elegh licensed CC-BY-SA 3.0: https://opengameart.org/content/elegh-epic-soundtrack Author's attribution notice: Please credit me as 'Elegh'. Refer people to this webpage/website.Thank you. Shall you use my music for your game, a link to the demo is welcome while not required.
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.