Octavarium is the eighth studio album by American progressive metal band Dream Theater. Released on June 7, 2005, it was the band's final release with Atlantic Records. Recorded between September 2004 and February 2005, it was the last album recorded at The Hit Factory in New York City. With it, the band decided to create "a classic Dream Theater album", drawing upon their various stylistic influences while trying to make the music less complex. The album takes its creative concept from the musical octave.