We probably shouldn't count on ever seeing Sam Smith, J Beibs, and One Republic doing a joint concert...but CatCall provides us with the next big thing.Mashups are what make the world go round. Well, at least the musical world. They fuse together the best things about our favorite artists and show the world our favorite parts of their songs. Mashups break down musical barriers by crossing boundaries that artists sometimes can't venture along.In this supreme mashup, University of Arizona's CatCall string together "Omen," "Apologize" and "Sorry" in this mega club mix style performance that's both creative and exciting.Enjoy.