Assess the valence intensity of the sentence "Katz uses archival footage , horrifying documents of lynchings , still photographs and charming old reel-to-reel recordings of Meeropol entertaining his children to create his song history , but most powerful of all is the song itself" based on the mood of the author. Offer a numerical rating between 0 and 1, with 1 representing highly positive and 0 representing highly negative.