What category best fits this site?

My site is for rap ghostwriting. We have a group of writers and basically rappers come to the site, explain what they want written and our writers write them a verse about that with complicated rhymes and flows.

I'm not sure what category this fits into. Would it be 'music producer'? 'Artist?' "Ghostwriting"? Any ideas?

Just suggest the URL from http://www.dmoz.org/Arts/Music/Styles/H/Hip_Hop/ and the review will define the appropriate /category where to list it.