Eminem and Rihanna work great together, as we have heard in Em's "Monster" song. So why not do more collaborations? Well the two will be collaborating because they are going on tour this summer, according to Hip Hop Wired. Their Monster tour will kick off in August but it will only be for a few dates. So far, Eminem mentioned to XXL, there would be a three-city tour. This should be interesting, but really, when is your girl Rihanna going to take a break from touring? She is a non-stop beast!