OpenGameArt.org
Menu Loops
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"Menu Loops" by Yubatake licensed CC-BY 4.0: https://opengameart.org/content/menu-loops Author's attribution notice: Please just mention my username and this site. A link to my profile would be nice but it's not necessary.
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.