Mac Miller and Wiz Khalifa are in the midst of the Under the Influence tour—no, we won't judge you for making a "joint tour" joke—a co-headlining set from two of the most popular MCs in the game. The tour is just the latest in a long history of dual headliners, from Dylan and the Dead to Red Hot Chili Peppers and Stone Temple Pilots to the upcoming Liberation tour with Mary J. Blige and D'Angelo. Fuse looks back on some of our favorites.