Rap is pop. Commercially successful rappers don't have time to write anyway. They are too busy trying to get that next fashion gig, movie role, talk show, music app, or whatever big lucrative deal.

Besides, people have been writing for 'ye since the beginning. "Jesus Walks" was Rhymefest all day. Speaking of 'fest, he helped write Common's song for Selma.

As long as the beat and verses are hot and mixed well together....that is all that counts.