Crack the Skye is the fourth studio album by American progressive metal band Mastodon, released on March 24, 2009 through Reprise Records. The album debuted at number 11 on the Billboard 200, selling 41,000 copies in its first week. In Australia, the album debuted at number 19. It had sold 200,000 copies in the US as of September 2010, making it one of their highest selling albums to date. Crack the Skye is the first studio album to feature drummer Brann Dailor as the band's third lead vocalist.