#FBF Imagine Dragons & Kendrick Lamar Deliver One Of The Best Grammy Performances With Their Mash-Up Of “Radioactive” and “Maad City” [VIDEO]

As the nominations for the 2015 ceremony are officially rolled out today, relive one of the show’s BEST performances ever when Kendrick Lamar joined Imagine Dragons for a mash-up of their tracks “Maad City” and “Radioactive”.