OpenGameArt.org
Forgotten Lullaby
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"Forgotten Lullaby" by Mega Pixel Music Lab licensed CC-BY 4.0: https://opengameart.org/content/forgotten-lullaby Author's attribution notice: Music by Mega Pixel Music Lab megapixelmusiclab.com
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.