It must be played on a glockenspiel
Maybe use this song for GD World. It's simplistic, and sounds great as well.
DJ Rub Rub 2 (Lufin'Lenny)
Maybe this will be or was for a level of Geometry Dash?
Sounds kinda cool, like for another secret challenge level in geometry dash ;)
Please contact me if you would like to use this in a project. We can discuss the details.