OpenGameArt.org
The Journey Continues
Credit line
"The Journey Continues" by northivanastan licensed CC0: https://opengameart.org/content/the-journey-continues Author's attribution notice: MIDI "The Journey Continues" by Ivan Stanton (northivanastan on OpenGameArt).
Where to put it: Game credits or video description. If the entry has a "Copyright/Attribution Notice", follow that.