Eminem and Jay-Z, two of rap's biggest stars, shared the stage in Detroit on Thursday night (November 21). Jay-Z was in town on his "Principal For A Day" tour, performing at St. Andrews Hall, when Eminem joined him onstage for a performance of their hit song "Renegade," from Jay-Z's The Blueprint album. Some 600 lucky fans who won tickets from a local radio station witnessed the two rap giants exchanging verses.