Any musicians sell their song on iTunes

I am setting up an account for a friend and want to know if anyone has had any experiences selling their work on iTunes?

Thanks for your interest in the iTunes Music Store.
Please use this form to tell us more about the types of music you have to offer. We are evaluating hundreds of applications, so it may take longer than we'd like to get back to you. But don't worry - we will review your application and contact you if we are interested in including your music in the iTunes Music Store. We will also keep your application on file for future reference, so there's no need to submit it more than once.
https://phobos.apple.com/WebObjects/.../wo/5.0.5.1.11