OpenGameArt.org
School day / Rain / Sun / Loop
Credit line
"School day / Rain / Sun / Loop" by KiluaBoy licensed CC0: https://opengameart.org/content/school-day-rain-sun-loop Author's attribution notice: Credits for Kilua Boy will help a lot (Not required)
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.