OpenGameArt.org
8 Bit Bassline #beansjam
Credit line
"8 Bit Bassline #beansjam" by Quitschie licensed CC0: https://opengameart.org/content/8-bit-bassline-beansjam Author's attribution notice: for all free
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.