Dream Theater is an American progressive metal band formed in 1985 under the name Majesty by John Petrucci, John Myung and Mike Portnoy while they attended Berklee College of Music in Boston, Massachusetts. They subsequently dropped out of their studies to concentrate further on the band that would ultimately become Dream Theater. Though a number of lineup changes followed, the three original members remained together along with James LaBrie and Jordan Rudess until September 8, 2010, when Portnoy left the band. In October 2010, the band held auditions for a drummer to replace Portnoy.

With their new name and band stability, Dream Theater concentrated on writing more material while playing more concerts in New York and in neighboring states. This eventually attracted the attention of Mechanic Records, a division of MCA. Dream Theater signed their first record contract with Mechanic on June 23, 1988 and set out to record their debut album. The band recorded the album at Kajem Victory Studios in Gladwyne, Pennsylvania. Recording the basic tracks took about 10 days, and the entire album was completed in about 3 weeks. When Dream and Day Unite was released in 1989 to far less fanfare than the band had anticipated. Mechanic ended up breaking the majority of the financial promises they had made to Dream Theater prior to signing their contract, so the band was restricted to playing around New York City. The promotional tour for the album consisted of just five concerts, all of which were relatively local. Their first show was at Sundance in Bay Shore, New York opening for the classic rock power trio Zebra. After the fourth show, Charlie Dominici was let go because the band was starting to feel the limitations of his voice based upon the vocal style they wanted. The band was looking for a singer with a style more like Bruce Dickinson or Geoff Tate, and Dominici's stage presence was not what they wanted for a front man. Shortly after, however, the band Marillion asked Dream Theater to open for them at a gig at the Ritz in New York, so Dominici was given the opportunity to perform one last time. It would be another two years before Dream Theater had a replacement vocalist. In 2003, Dream Theater entered the studio to write and record another album. Unlike Scenes from a Memory, which had been written and recorded simultaneously in the studio, the band took a different approach by setting aside three weeks for writing prior to recording. In the middle of the recording sessions for the album, a special tour with two other progressive metal bands, Queensryche and Fates Warning, was undertaken in North America. Referred to in the band's promotional material as the "Escape from the Studio American tour", the tour featured Queensryche and Dream Theater as co-headlining acts with Fates Warning performing supporting act duties. As a finale for each concert there was an extended encore in which both Dream Theater and Queensryche performed together on stage simultaneously, often playing cover songs. At the completion of the tour, Dream Theater returned to the studio to finish the recording of their seventh album, Train of Thought. In contrast to the extended songs of their previous album, the band aimed to write a more song-oriented album, inspired in part by covering the Master of Puppets and Number of the Beast albums on their previous concert tour. Although the album was a critical success, its more straightforward metal sound alienated many of the band's existing fans, who had been attracted by the band's roots in progressive rock. During this time they also re-released their first two live videos for the first time on DVD, entitled "Images and Words: Live in Tokyo/5 Years in a Livetime" on June 29, 2004, through Rhino Records. This release was certified Platinum on March 22, 2006. Another world tour followed, named Train of Thought Tour. A modest North American tour was completed by the two bands, which Dream Theater supported Yes, a band which had been a major influence on their own musical style. After which Dream Theater continued to tour the world with their so-called "An Evening With Dream Theater" shows. The latter were captured in another live CD/DVD release, recorded at the famous Nippon Budokan Hall in Tokyo, Japan on their Train of Thought Tour. Live at Budokan was released on October 5, 2004, and was certified Platinum in the US on January 26, 2005. After their Train of Thought promotional tour, Dream Theater entered the Hit Factory studios in NYC to record their eighth album. They would in fact become the final group to use the famous studio, which closed on April 1, 2005. Octavarium was released on June 7, 2005, and took the band's sound in yet another new direction. Its eight songs included a continuation of Portnoy's "Twelve-step" saga ("The Root of All Evil", steps 6-7 in the 12-step plan), as well as the title track, a musically versatile 24 minute epic rivaling "A Change of Seasons". Octavarium received mixed reviews from fans and has been the subject of spirited debate. Octavarium was the last album under their seven-album deal with Elektra Records, which had inherited the contract upon its absorption of EastWest Records. Dream Theater started the Octavarium Tour extensively throughout 2005 and 2006 to celebrate their 20th Anniversary as a band, including a headlining spot on Gigantour alongside Megadeth and put together by frontman Dave Mustaine, also featuring Fear Factory, Nevermore and Symphony X. During a show on August 2, 2005 in Dallas, the band paid tribute to Pantera's late guitarist Dimebag Darrell by performing the song "Cemetery Gates" as an encore. In addition was the unexpected appearance of fellow musicians Russell Allen (Symphony X vocalist), Burton C. Bell (Fear Factory vocalist) and Dave Mustaine (Megadeth vocalist/guitarist), who joined the band on stage to perform parts of the song. Dream Theater later departed from Gigantour 2005 a few dates before it ended and continued on with their own series of concerts, several of which were recorded and released for the band's fanclubs. The 20th anniversary tour concluded with a show at Radio City Music Hall in New York City on April 1, 2006. Though the show had minimal promotion, it was sold out days after tickets were made available. This show, which was recorded for a CD/DVD called Score released on August 29, 2006 through Rhino Records, featured songs from the band's entire history, as well a second half accompanied by a full symphony orchestra (the "Octavarium Orchestra"). This release was the band's third Live DVD release to be certified Platinum in the US on October 11, 2006.

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