OpenGameArt.org
Jazzy Vibes #36 - Loop - Smooth Jazz
Credit line
"Jazzy Vibes #36 - Loop - Smooth Jazz" by Tri-Tachyon licensed CC-BY 4.0: https://opengameart.org/content/jazzy-vibes-36-loop-smooth-jazz Author's attribution notice: Please Use: "Music by Tri-Tachyon - https://soundcloud.com/tri-tachyon/albums".
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.