You gotta love it when artists infuse one genre into another and the two collide head-on. While some aren’t able to create a beautiful monster, the ones that do have the gifts of recreating it over and over. So, when your favorite rapper calls on your favorite R&B singer or vice versa, the likelihood of it turning out to be fire is pretty high. But, every so often, the biggest question is: “Can they do it again, and again, and again?” Some of these tandems have proven that they have the recipe in making great tracks together repeatedly. See who made the cut.