Fall out boy performs My Songs Know What You Did In the Dark ( Light Em Up ) at the iheartradio music festival 2015.brFall Out Boy perform My Songs Know What You Did In The Dark (Light Em Up) at Radio 1s Big Weekend in Norwich 2015. Visit the Big Weekend website at .brbrYou may need to turn up your speakers for this one, sorry. I recorded remotely and couldnt hear how low the volume was. Setlist: 1:48 - Sugar Were Goin Down .brFall Out Boy is joined by finalist Matt McAndrew on their hit Centuries. » Subscribe for More: » Watch The Voice Mondays & Tuesdays .