The album follows a quadriplegic who learns astral projection. On his journey he flies too close to the sun, burning his umbilical cord which connects him to his body, and flies into oblivion. At the same time in Czarist Russia, Rasputin and his cult were channeling spirits and brought the quadriplegic to their time. He explains his situation and foretells the assassination of Rasputin. Inevitably Rasputin is assassinated and Rasputin guides him back to his body. The band had debuted three new tracks at the Bonnaroo Music Festival, but did not play any more live shows before the album's release, due to fears of internet distribution and wanting to play the songs to the right audience. Drummer Brann Dailor sings lead vocals for the verses of the song "Oblivion". Mastodon was a headliner at the Scion Rock Fest on February 28, 2009, performing a set containing three tracks from "Crack the Skye", the first time these songs were played since being finalized and recorded. On May 15, 2009, Mastodon performed a shortened version of "Oblivion" on the "Late Show with David Letterman".