The Alchemy Index, Vols. III & IV: Air & Earth by Thrice

The Alchemy Index Vols. III & IV: Air & Earth is the sixth studio album by American rock band Thrice. It consists of the final two volumes of The Alchemy Index, a four-disc concept album that was split between two releases, the first in October 2007 and the second in April 2008. The band originally planned to release four discs at once, each disc with six tracks representing one of the four elements: Fire, Water, Earth, and Air. A blog titled The Alchemy Index chronicled the album's progress for fans. The artwork for the album was designed by Dustin Kensrue. The album debuted at #17 on the Billboard 200.