Notahotshot,

Now the publish button is used for if lets say you make your own song, you can get a creative commons license to protect your work, and set the terms for how people can use you song, and I believe it is free but I may be mistaken but anyways the point of it is that you can apply your license for your song, At least that is what I understand of it, but someone else may be able to give more accurate information.

Kynto