input: Nord_(Year_of_No_Light_album) | genre | Sludge_metal Sludge_metal | musicSubgenre | Southern_sludge
target: The Year of No Light album Nord is in the sludge metal genre, one variety of which is southern sludge.
references: The Year of No Light album Nord is in the sludge metal genre, one variety of which is southern sludge. Nord is an album by Year of No Light in the sludge metal genre, of which southern sludge is a subgenre.