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. />
James LaBrie – vocals
John Petrucci – guitars, vocals, producer
Jordan Rudess – keyboards, Continuum, lap steel guitar
John Myung – bass
Mike Portnoy – drums, vocals, percussion, producer, art concept
Orchestra on "Sacrificed Sons" and "Octavarium"
Elena Barere – concertmaster
Katherine Fong, Ann Lehmann, Katherine Livolsi-Stern, Laura McGinniss, Catherine Ro, Ricky Sortomme, Yuri Vodovoz – violins
Vincent Lionti, Karen Dreyfus – violas
Richard Locker, Jeanne LeBlanc – celli
Pamela Sklar – flute
Joe Anderer, Stewart Rose – French horns
String quartet on "The Answer Lies Within"
Elena Barere – first violin
Carol Webb – second violin
Vincent Lionti – viola
Richard Locker – cello
Jamshied Sharifi – strings arrangement, conductor
Jill Dell'Abate - orchestral contractor
Doug Oberkircher – engineer
Colleen Culhane, Kaori Kinoshita, Ryan Simms – assistant engineers
Bert Baldwin – additional studio assistance
Michael H. Brauer – mixing
Keith Gary – assistant and Pro Tools engineer
Will Hensley – second assistant
George Marino – mastering
Hugh Syme – art direction, design, illustration, art concept
Colin Lane – photography
