“Nicki Minaj and Beyoncé's second collaboration—the highly-anticipated followup to the "Flawless" remix—is an opus in four acts. Like a great opera or short play, "Feeling Myself" has a beginning, a middle, and an end. First, there's tough Nicki, who delivers masturbation puns and a virtuosic indictment of competitors who aren't even in her tax bracket, all in the same sentence. And then there's sa”