Ok, I have to ask, what is a rap "ghost writer"? I can understand a ghost writer for a book or article. Generally, someone wants to publish a biography or memoir or maybe a scholarly work. They want the work to be readable and grammatically correct.

But I've never heard of a song writer (and Raps are still considered songs last time I looked) who didn't want credit. Singers are performers. While many do write their own work, many will perform other people's work. But when they do the song writer gets credit.

So if you want to write Raps, then write them. Next you try to get an artist to perform them.

It is someone who writes a rap song for an individual who will only record an perform this song for a undisclosed sum of money. And I could write it for you,sign away writes and everything for the write price$$$$$

That is pretty close to the definition of a ghost writer period. And, again, I've never heard of such a thing in the song writing industry. Performers record other people's work ALL the time. I've never heard of a song writer who would not want credit. Why would someone give up their rights to residuals? It would have to be a whole lot of money to compensate. And why would performers require it?

Again, write your songs and try to get artists to showcase them. If you write good songs other artists will want you to write for them. If you don't get credit, no one knows about you and that's why you can't get people to pay you to write for them.