OpenGameArt.org
Ukulele Forest (Beginning, Loop and End)
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"Ukulele Forest (Beginning, Loop and End)" by StarNinjas licensed CC0: https://opengameart.org/content/ukulele-forest-beginning-loop-and-end Author's attribution notice: Credit is appreciated, thanks! (Just put a link to my OGA profile) I'd also appreciate if you could show me the projects you use these in!
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.