Wait for the loop to go through once, then the mashup will start. (In the meantime, do something else on a different tab.) How to use: Export the song and insert it into GD as a NONG (Like a NONG for a level). If you have bought the Custom Menu Music option from the secret Mechanic shop, then you can use the song as your menu music.
Mashup made by me. Uses: The GD menu loop by Zhenmuron (AKA RobTop) The practice music by OcularNebula Background made by me because it was funny.