If you weren't tuned into the 56th Annual Grammy Awards, then you certainly missed one hell of a performance. Imagine Dragons, flanked by none other than Kendrick Lamar, delivered an exhilarating version of their hit single "Radioactive" with the TDE front man on the remix. On the song, Kendrick snaps lyrically and delivers some true to form hiii-powered bars. If you missed the performance, you can peep it here, and above is the actual full-length track. It's only right that they dropped off this one the night of the historical performance.