Now that I think about it, Sylvia Robinson is the mogul of all moguls. She saw what was going on in the parks and on the streets and had the sense to make a record in a recording studio.
Accordingly, everybody says that she ripped them off. She died a while back. It's unfortunate the way things played out because everybody was trying to sue her so she wouldn't do interviews. As a result we never got to hear her side of the story, which is a shame.
But yeah, Rihanna, Beyonce, Mariah Carey, Janet Jackson, etc. may or may not be considered moguls, but they don't rap.
Missy and Queen Latifah rap.
Would you guys consider Michael Jackson a mogul or just a really, really, really big pop star?
I consider Prince a mogul because he produced a handful of acts (The Time, Vanity 6, Appallonia 6, Sheila E). And he figured out how to circumvent the music industry; Basically he'd have a concert and you get a copy of the cd with the price of admission. He completely removed the record label from the equation. But he had to work his way up from the bottom. He spent his first 10+ years on a record label before he figured it out.
Prince also directed a handful of movies. I wonder how much he was worth when he died.