On the 13th Day is the 17th studio album from the rock group Magnum (including Keeping the Nite Light Burning and ignoring Evolution), which was released in September 2012, under the label of Steamhammer Records/SPV. The cover artwork was painted by Rodney Matthews. Bob Catley has stated that he considers On the 13th Day to be Magnum's rockiest album to date, with the track Dance of the Black Tattoo possibly classifying as a heavy metal song.