The utter struggle, even with backing tracks to help her get through the chorus
And please, save me trouble of answering with the same tired ass 3 performances that you've posted in this thread to show that on three occassions Rihanna could actually sing. Cl0cked my ass.
And, rihanna does much better at emoting than gaga. when she sings about heartbreak, you can actually feel the pain. she displays it in her voice and body language. I've yet to see gaga do anything close to this.