'Crack the Skye' is the fourth full-length studio album by American heavy metal band Mastodon, released in March 2009.
Vocalist/bassist Troy Sanders said in an interview with Stereogum, "Crack the Skye is a departure from everything we've previously recorded in the sense that we kinda strapped on our aeroshells and departed from Earth for a while, and then captained to the ethereal element of the universe and kind of slept on the roof of the world for a while to get a perspective on this record. ... Basically we're exploring the ethereal world. We're dissecting the dark matter that dominates the universe, in a nutshell."
Tracklisting:
01 Oblivion
02 Divinations
03 Quintessence
04 The Czar
i. Usurper
ii. Escape
iii. Martyr
iv. Spiral
05 Ghost of Karelia
06 Crack the Skye
07 The Last Baron