Ya'll really doing this over a title everybody and their mother has been called at some point in their career.
In my community, black people, and where i'm from Whitney is usually considered the Queen of Pop. This is pretty much what is considered to be the music trinity/royalty
But if certain people want Madonna to be the Queen of Pop just let it be. She is probably the biggest person that ever created pure pop music. The rest of them were mixed with something (MJ, Whitney, Janet, Mariah etc.) It ain't that serious either way. Better to have a title that only you are called "The Voice" "Godfather of Soul" etc. than one everybody tries to claim.