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Sky Blue. Disc 1 is the original album remastered while Disc 2, Crack the Skye: The Score, features instrumental versions of each track. . Catalog Number: A 724887 Color: Blue Format: LP UPC: 093624857570 15th Anniversary Deluxe Edition of Mastodon's fourth studio album, Crack the Skye. Originally released in March 2009, the album features "Oblivion", "Divinations" "The Last Baron" and more.