Rihanna has released some new music and it features Kanye West and Paul McCartney. We heard that they were working together and now we finally got some music out of it. The song, "FourFiveSeconds," is nothing like what I expected, but it's pretty great. McCartney handles the guitar while Rihanna and 'Ye take over the singing of the verses and hook. It's a perfect example of what happens when artists collaborate simply to make good music. I'm excited to see what else Rihanna has in store for us. You can buy the song on iTunes here. Enjoy.