OpenGameArt.org
Alien Party In The Forest Canopy
Credit line
"Alien Party In The Forest Canopy" by Mega Pixel Music Lab licensed CC-BY-SA 4.0: https://opengameart.org/content/alien-party-in-the-forest-canopy 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.