They regrouped and recorded Save Rock and Roll ( 2013 ) , which gave the band their second career number one and produced the top 20 single `` My Songs Know What You Did in the Dark ( Light Em Up ) '' .
Fall Out Boy came off hiatus in 2013 , releasing a new single `` My Songs Know What You Did in the Dark ( Light 'Em Up ) '' and an album Save Rock and Roll , along with a supporting tour .