OpenGameArt.org
Funky Experimental Chiptune
Credit line
"Funky Experimental Chiptune" by linxiaoma licensed CC-BY-SA 4.0: https://opengameart.org/content/funky-experimental-chiptune Author's attribution notice: Markus Lindner
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.