Polly
Most folks don't get anywhere in the business without a publisher. They are the folks who get you contacts with the big names. Getting signed with a big name puiblisher is a plus. But you pay for it. 50%. But the publisher will also pay for the expensive demo and promote your song.
You can be your own publisher and keep all the money for yourself if you have the contacts. If you are able to get a young up and coming artist to cut your song you can act as your own publisher. But you will also have to pay for everything yourself.

Bill
http://www.soundclick.com/billrobinson
http://www.dreamqueststudio.com
Skype; bill.robinson12

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." --Thomas Jefferson didn't say it

http://voidnow.org/
http://www.americansworking.com/