I do not know if anyone already knew this, but I will nonetheless make this public. My music is accessable through the Newgrounds API, and RobTop has whitelisted me, so therefore it can be used in Geometry Dash.
Here is the Perfect Platonic Forms mix in Geometry Dash:
Also, all of my music is licensed under CC BY, so my music can be played if it is used in a YouTube video.
The reason that I wanted to clarify this is because I am actually an avid player of Geometry Dash myself, and I would be very happy if one of my tracks was used in the game.
Thank you! By the way, I am still working on music, and I should have a new track uploaded tommorow! Bye! ^w^