[SilverKiller]

You need to have .mp3 at the end of the link +

Read this to know how to upload right on dropbox.com

First go to dropbox.com and if you have an account, upload your .mp3 file, if you don't have an account, register and upload a .mp3, then right click on it and share link, you will get .mp3 at the end of the link when you click it, copy and paste the link and change the dropbox.com to dl.dropbox.com, and copy paste the link and paste it in the Function.

EDIT: Too late silver.