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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 Massachusetts. They subsequently dropped out of their studies to further concentrate 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 Portnoy's replacement drummer. Mike Mangini was announced as the new permanent drummer on April 29, 2011. The band finished recording a new album, A Dramatic Turn of Events, which is due September 13, 2011.

The band is well known for the technical proficiency of its instrumentalists, who have won many awards from music instruction magazines. Guitarist John Petrucci has been named as the third player on the G3 tour six times, more than any invited players. In 2009 he was named the No. 2 best metal guitarist by Joel McIver in his book The 100 Greatest Metal Guitarists. He was also named as one of the "Top 10 Greatest Guitar Shredders of All Time" by GuitarOne magazine. Former drummer Mike Portnoy has won 23 awards from Modern Drummer Magazine and is also the second youngest person (at the age of 37) to be inducted into the Rock Drummer Hall of Fame. John Myung was voted the greatest bassist of all time in a poll conducted by MusicRadar in August through September 2010. The band was inducted into the Long Island Music Hall of Fame in 2010.

The band's highest selling album is the gold selling Images and Words (1992), which reached #61 on the Billboard 200 charts. Both the 1994 release Awake and their 2002 release Six Degrees of Inner Turbulence also entered the charts at #32 and #46 respectively and received mostly positive reviews. Six Degrees of Inner Turbulence also led to Dream Theater becoming the initial band reviewed in the Music Section of Entertainment Weekly during its opening week of release, despite the magazine generally preferring more mainstream music. In 2007, Systematic Chaos entered U.S. Billboard 200 at #19. By 2008, Dream Theater had sold over 2.1 million albums in the U.S. and over 10 million records worldwide.
The band's tenth studio album, Black Clouds & Silver Linings, was released on June 23, 2009. It entered the U.S. Billboard 200 at #6 and Eurochart Hot 100 at #1, marking their highest entry on either chart.

Early years (1985-1988)

Formation

Dream Theater was formed in Massachusetts in 1985 when guitarist John Petrucci, bassist John Myung, and drummer Mike Portnoy decided to form a band while attending the Berklee College of Music. The trio started by covering Rush and Iron Maiden songs in the rehearsal rooms at Berklee.
Myung, Petrucci, and Portnoy joined together on the name Majesty for their newly formed group. According to the The Score So Far... documentary, they were waiting in line for tickets to a Rush concert at the Berklee Performance Center while listening to the band on a boom box. Portnoy commented that the ending of the song "Bastille Day" (from the album Caress of Steel) sounded "majestic". It was then decided that Majesty would be the band's name.

The trio then set out to fill the remaining positions in the group. Petrucci asked his high school band-mate Kevin Moore to play the keyboard. After he accepted the position, another friend from home, Chris Collins, was recruited as lead vocalist after band members heard him sing a cover of "Queen of the Reich" by Queensrÿche. During this time, Portnoy, Petrucci, and Myung's hectic schedules forced them to abandon their studies to concentrate on their music, as they did not feel they could learn more in college. Moore also left his college, SUNY Fredonia, to concentrate on the band.

The beginning months of 1986 were filled with various concert dates in and around the New York City area. During this time, the band recorded a collection of demos, titled The Majesty Demos. The initial run of 1,000 sold out within six months, and dubbed copies of the cassette became popular within the progressive metal scene. The Majesty Demos are still available in their original tape format today, despite being released officially on CD, through Mike Portnoy's YtseJam Records.
In November 1986, after a few months of writing and performing together, Chris Collins was fired. After a year of trying to find a replacement, Charlie Dominici, who was far older and more experienced than anyone else in the band, successfully auditioned for the group. With the stability that Dominici's appointment brought to Majesty, they began to increase the number of shows played in the New York City area, gaining a considerable amount of exposure.

Shortly after hiring Dominici, a Las Vegas group also named Majestythreatened legal action for intellectual property infringement related to the use of their name, so the band was forced to adopt a new moniker. Various possibilities were proposed and tested, among them Glasser, Magus, and M1, which were all rejected, though the band did go as Glasser for about a week, though fans reacted poorly to this decision. Eventually, Portnoy's father suggested the name Dream Theater, the name of a small theater he ran in Monterey, California, and the name stuck.

When Dream and Day Unite (1988-1990)

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 more of a Bruce Dickinson/Geoff Tate type of singer. And his 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.

The Atlantic years

Images and Words and the addition of James LaBrie (1991-1993)

Following Dominici's departure, Dream Theater fought successfully to be released from their contract with Mechanic, and set about auditioning singers and writing material for their next album. In their search for a new singer, they auditioned over 200 people, among them former Fates Warning front man John Arch; all were turned down. In mid-1990, at a gig in New York, Dream Theater introduced Steve Stone as their new singer. They had successfully recorded demos with him, which can be seen on the Images and Words Demos, though he only performed one live show with them that ended up disastrous, and Stone was fired immediately. The band says he had been dancing around the stage in a rather odd manner, seemingly doing a bad impression of Bruce Dickinson. Also, he had infamously shouted 'Scream for me Long Beach!' several times throughout the show, although they were actually performing in Bayshore, embarrassing the band further. It was five months before Dream Theater played another show, this time all-instrumental (under the name YtseJam). Until 1991, the band remained focused in an attempt to hire another singer and writing additional music. It was during this period that they wrote the majority of what would become 1992's Images and Words.

In January 1991, Kevin James LaBrie, of glam metal band Winter Rose, was flown from Canada to New York for an audition. LaBrie jammed on three songs with the band, and was immediately hired to fill the vocalist position. Once recruited, LaBrie decided to drop his first name to avoid confusion with the other Kevin in the band. For the next few months, the band returned to playing live shows (still mostly around NYC), while working on vocal parts for the music written before acquiring LaBrie. Derek Shulman and Atco Records (now EastWest), a division of Elektra Records, signed Dream Theater to a seven album contract based on a three song demo (later made available as "The Atco Demos" through the Dream Theater fan club).

The first album to be recorded under their new record contract was 1992's Images and Words. For promotion, the label released a CD Single and video clip for the song "Another Day", but neither made significant commercial impact. The song "Pull Me Under", however, managed to garner a high level of radio airplay without any organized promotion from the band or their label. In response, ATCO produced a video clip for "Pull Me Under", which saw heavy rotation on MTV. A third video clip was produced for "Take the Time", but it was not nearly as successful as "Pull Me Under".

The success of "Pull Me Under", combined with relentless touring throughout the U.S. and Japan, caused Images and Words to achieve gold record certification in the States and platinum status in Japan. A tour of Europe followed in 1993, which included a show at London's famed Marquee Club. The show was recorded and released as Live at the Marquee, Dream Theater's first official live album. Additionally, a video compilation of their Japanese concerts (mixed in with documentary-style footage of the off-stage portion of the tour) was released as Images and Words: Live in Tokyo.

Awake and Kevin Moore's departure (1994-1995)

Eager to work on fresh material, Dream Theater retreated to the studio in May 1994. Awake, Dream Theater's third studio album, was released on October 4, 1994 in a hail of controversy among fans. Shortly before the album was mixed, Moore announced to the rest of the band that he was simply no longer interested in touring, nor did he favor the style of music Dream Theater performed and would be quitting Dream Theater to concentrate on his own musical interests. As a result, the band had to scramble to find a replacement keyboardist before a tour could be considered.

Jens Johansson, who would go on to become a member of Stratovarius, was among the biggest names to audition, however the band members were eager to fill the position with keyboardist Jordan Rudess. Portnoy and Petrucci had come across Rudess in Keyboard Magazine, where he was recognized as "best new talent" in the readers' poll. The two invited him to play a trial gig with the band at the Concrete Foundations Forum in Burbank, California. For the members of Dream Theater, the show went incredibly well, and Rudess was asked to fill the keyboardist position permanently, however Rudess opted to tour with The Dixie Dregs instead, since it granted him more personal latitude. Dream Theater hired fellow Berklee alumnus Derek Sherinian, who had previously toured and recorded with Alice Cooper and KISS, to fill in for the Awake promotional tour. By the conclusion of the tour, the band decided to take Sherinian on as Moore's full-time replacement.

A Change of Seasons, Falling into Infinity (1995-1998)

Once again finding themselves with a new member, Dream Theater did not immediately start working on new material. Fans around the world, united on the YtseJam Mailing List (the most popular form of communication between Dream Theater fans at that point), had started placing pressure on the band to officially release the song "A Change of Seasons". It had been written in 1989 and was intended to be a part of Images and Words, but at almost 17 minutes, it was deemed too long for studio placement. However, the band did perform it live on occasion while continuing to revise it in the years leading up to 1995.

The petition was successful, and the group entered BearTracks Studios in New York in May 1995 to rewrite and record the 23 minute song with Sherinian contributing significantly to the final product. To disseminate "A Change of Seasons", the band released it as an EP along with a collection of cover songs recorded live at the Uncovered fan club gig.

After a short run of small concerts to promote A Change of Seasons, Dream Theater took a break for a few months. To keep busy, however, the band released a special Christmas CD through their official fan club, consisting of rare live tracks recorded during the band's early years. They continued releasing a new CD each Christmas until 2005. Also during the break the individual members set out to write compositions for their upcoming collaborative writing sessions.

Meanwhile, there were several changes at EastWest, and Dream Theater's main contact within the label was fired. As a result, the new team at the company were unaccustomed to the relationship Dream Theater had with former EastWest personnel, and they pressured them to write an album that was more accessible. In mid-1997, they entered the studio to write their next album. In addition to pressuring the band to adopt a more mainstream sound, EastWest recruited writer/producer Desmond Child to work with Petrucci on polishing the lyrics to his song "You or Me". The whole band substantially reworked the music to the song, and it appeared on the album as "You Not Me" with a chorus that was barely reminiscent of the original. Child also had a noticeable impact on the album, with a shift towards compositions that were less complex and more radio-friendly.

The band wrote almost two CDs worth of material, including a 20 minute long follow-up to the Images and Words song "Metropolis Part 1: The Miracle and the Sleeper". The label, however, did not allow the release of a double album because it felt that a 140-minute record would not be digestible by the general public. James LaBrie also felt that the CD should be a single disc. The unused songs were later released in the Ytsejam Records release The Falling into Infinity Demos.

The material that made it onto the album proper was released as Falling into Infinity, which received a mixed reception from fans who were more familiar with the band's earlier sound. While the album was moderately progressive-sounding, tracks such as "Hollow Years" and "You Not Me" prompted some to believe it was the dawn of a new, mainstream-sounding Dream Theater. Overall, the album was both a critical and commercial disappointment. Although Portnoy did not speak out publicly at the time, many years later, in the 2004 DVD commentary for 5 Years in a Livetime, he revealed that he had been so discouraged during this period he'd considered disbanding Dream Theater altogether.

During the European leg of the Touring into Infinity world tour, two shows were recorded for a live album entitled Once in a LIVEtime, in France and The Netherlands. The album was released at around the same time as the video 5 Years in a Livetime, which chronicled the time from when Kevin Moore left the band up to the Falling into Infinity promotional tour.

Addition of Jordan Rudess and Metropolis Pt. 2: Scenes from a Memory (1999-2000)

In 1997, Magna Carta Records' Mike Varney invited Portnoy to assemble a progressive 'supergroup' to work on an album, which would become the first in a long string of side-projects for the members of Dream Theater. The lineup consisted of Portnoy on drums, Petrucci on guitar, Tony Levin on bass, and keyboardist Jordan Rudess, who had finished with the Dixie Dregs. The band assumed the name Liquid Tension Experiment, and would act as a medium through which Portnoy and Petrucci could once again court Rudess to join Dream Theater. In 1999, he accepted an offer to become the third full-time Dream Theater keyboardist, replacing Sherinian.

With yet another new member, Dream Theater entered BearTracks Studio once again to write and record their next album. As a result of an ultimatum from Portnoy, the label gave the band complete creative control. The follow-up to "Metropolis Part 1", which was written during the Falling Into Infinity sessions (but not used on that album), was taken off the shelf for reworking. They decided to expand the 20-minute song into a complete concept album, with a story revolving around themes such as reincarnation, murder and betrayal. To avoid stirring up the fan base, a tight veil of secrecy enveloped the writing and recording process. The only things fans were privy to prior to its release were a track list that had been leaked against the band's wishes, and a release date. In 1999, Metropolis Pt. 2: Scenes from a Memory was released to high critical acclaim. It was hailed as Dream Theater's masterpiece by many fans and critics alike, despite only reaching #73 on the US album chart.

The album was mixed by David Bottrill, but only a few of his mixes made it on the final album. The bulk was remixed by Kevin Shirley. The rest of the mixes can be heard in the band's official bootleg "The Making of Scenes from a Memory".

A massive world tour followed recording the album, taking over a year to complete, by far their largest to that point. The concerts reflected the theatrical aspect of the album. They played the entire Scenes From a Memory album from start to finish, with a video screen on the back wall of the stage showing a narrative companion to the story of the album. In addition to playing the album in its entirety, the band also played a second set of Dream Theater songs, as well as a few covers and improvisations of old Dream Theater material. For one extra special show, at the Roseland Ballroom in New York City, actors were hired to play characters in the story, and a gospel choir was enlisted to perform in some sections of the performance.
This show, the last North American date of the tour, was recorded for the band's first DVD release. After many technical delays, the DVD, titled Metropolis 2000, was released in early 2001. Shortly after, the band announced that an audio version of the concert, with the entire four-hour long set-list (some of which had to be cut from the DVD to save space), would be released.

The cover for the CD version of the concert, titled Live Scenes from New York, depicted one of Dream Theater's early logos (the Images and Words-era burning heart, modeled on the Sacred Heart of Christ) modified to show an apple (as in "Big Apple") instead of the heart, and the New York skyline, including the twin towers of the World Trade Center, in the flame above it. In an unfortunate coincidence, the album was released on the same date as the September 11 attacks. The album was quickly recalled by the band and was re-released with revised artwork later, though some copies were sold, and have since become rare collectors items for fans.

Six Degrees of Inner Turbulence (2001-2002)

Putting the whole ordeal behind them, Dream Theater once again entered BearTracks Studios to record their sixth studio album. Four years after they first petitioned EastWest to allow them to release a double album, they finally got their chance with Six Degrees of Inner Turbulence. The first disc consisted of five tracks of 7–13 minutes in length, and the second disc was devoted entirely to the 42-minute title track, which is to date the longest song Dream Theater has written. The genesis of that song came when Rudess wrote what would become the "Overture" section of "Six Degrees of Inner Turbulence", and the band took some different melodies and ideas contained within it and expanded them into chapters of a complete story.

Six Degrees of Inner Turbulence ended up being received very well by critics and the press. It was the most publicized of Dream Theater's albums since Awake, debuting on the Billboard charts at #46 and the Billboard Internet charts at #1. Throughout the next year and a half they toured the world once more, with an expanded live show including a select few special "album cover" gigs (see Cover songs section, below), in which they played Metallica's Master of Puppets and Iron Maiden's The Number of the Beast in their entirety.

Train of Thought (2003-2004)

During 2003, Dream Theater entered the studio to write and record another album. Since Scenes from a Memory was written and recorded simultaneously in the studio, in the spirit of change, 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, Queensrÿche and Fates Warning, was undertaken in North America. The "Escape from the Studio American tour", as it was referred to in Dream Theater's promotional material, featured Queensrÿche 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 Queensrÿche 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, the follow-up to sixth double disc album Six Degrees of Inner Turbulence. They concentrated more on writing a great song-oriented album, a mindset inspired by covering Master of Puppets and Number of the Beast on their previous concert tour. As a result, the more straight-forward metal sound of those two albums seemed to creep into Train of Thought. The album was a critical success, but it alienated a fair proportion of Dream Theater's fans who preferred traditional progressive rock, such as Yes or King Crimson. Regardless, it seemed to expand Dream Theater's fan base into new territory, capturing many more metal fans.

Another world tour followed, during which Dream Theater performed support act duties for one of their major influences, Yes. A modest North American tour was completed by the two bands, after which Dream Theater continued to tour the world with their so-called "An Evening With Dream Theater" shows.
Their next move was to release another live CD/DVD combination, this time recorded at the famous Nippon Budokan Hall in Tokyo, Japan on their Train of Thought World Tour. Live at Budokan was released on October 5, 2004.

Octavarium (2005-2006)

Upon the completion of their Train of Thought promotional tour, Dream Theater entered the Hit Factory studios in NYC to record their eighth album. As it turned out, they would be the last group ever to record in that famous studio, and after they wrapped up their final session, the lights were turned off at the studio forever.

Octavarium was released on June 7, 2005, and took the band's sound in yet another new direction. Among its eight songs is 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 toured 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 a few dates before it ended and continued on with their own series of concerts. Several concerts were recorded and released for the 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, was the band's first concert accompanied by an orchestra (the "Octavarium Orchestra").

The Roadrunner years

Systematic Chaos and Greatest Hit (2006-2008)

Dream Theater's next album Systematic Chaos was released on June 5, 2007. The record marked their first with new label Roadrunner Records, a subsidiary of the band's previous label Atlantic Records. Roadrunner implemented increased promotion for the album, and as a result, Systematic Chaos reached number 19 on the Billboard 200. It also saw the release of a video for "Constant Motion" on July 14, the band's first music video since Hollow Years in 1997. An authorized book entitled Lifting Shadows, detailing their first twenty years, was also released in 2007, with an updated and expanded edition released in 2009 Systematic Chaos contains eight tracks, but technically only seven songs. The album contains an epic titled "In the Presence of Enemies", bookending the album as tracks 1 and 8, Portnoy's continuing AA Saga with the song "Repentance", and a song of political nature, "Prophets of War".

The 2007/2008 Chaos In Motion World Tour started off in Italy. Dream Theater played in the Gods of Metal concert on June 3, 2007. Dream Theater also appeared at the Fields Of Rock Festival in the Netherlands on June 17, 2007. They also played at various other European festivals including the UK's Download Festival and the French festival Hellfest Summer Open Air with other bands such as Megadeth, Korn, Mastodon and Slayer.

Dream Theater returned to perform the North American leg of the tour on July 24 in San Diego, California and wrapped up on August 26 in Philadelphia, Pennsylvania. They played with opening acts Redemption and Into Eternity. The "Chaos In Motion" tour continued for the rest of the year and into 2008, playing shows in Asia, South America and, for the first time, Australia.

On April 1, 2008, a two-disc compilation album entitled Greatest Hit (...and 21 Other Pretty Cool Songs) was released by the band. The title jokingly references the song "Pull Me Under", the band's only significant radio hit. It also includes three song re-mixes from their second album, Images and Words, five edited versions of previously released songs, and a track from a single B-side. Unlike most greatest hits compilations, Dream Theater was actively involved with the album, coming up with the tracklisting that they felt best represented their musical careers.

Mike Portnoy, after the release of Greatest Hit, organized a new tour called Progressive Nation 2008. Unlike previous Dream Theater tours, performances were held in cities that they had not visited before in the past (such as Vancouver, Canada) or cities they had not played in for several years. This tour also marked the first time, since the release of Images and Words, where the group performed in small venues and performance halls.

After this tour, the band released a DVD set called Chaos in Motion 2007–2008, a compilation of songs from the tour supporting their 9th album, Systematic Chaos. There were two sets of DVDs released. One was a regular two disk set while the Special Edition set contained three CDs of music that went along with the DVDs. It was released on September 30, 2008.

Black Clouds & Silver Linings and Mike Portnoy's Departure (2008-2010)

Mike Portnoy announced on June 2, 2008 that the band would be entering the studio to record a new album. On October 7, 2008, Dream Theater began work on their 10th album. The album, titled Black Clouds & Silver Linings, was released on June 23, 2009. In addition to the standard CD, the album is available on vinyl LP, as well as a 3-disc Special Edition CD that includes the full album, a CD of instrumental mixes of the album and a CD of six cover songs from artists such as Queen and Rainbow.
On May 1, Mike Portnoy spoke to Metal Hammer about the new album for their podcast saying that while 'The Shattered Fortress' was the last in a series of songs about his 12 Steps recovery from alcoholism, 'The Best of Times' "is a real heavy personal subject about my dad who passed away during the making of the album," adding, "He was battling cancer throughout its making." The band has also announced a second Progressive Nation tour, including the tour's first performances in Europe. Opeth and Unexpect supported Dream Theater in Europe, while Zappa Plays Zappa and Scale the Summit played the North American leg, with Bigelf playing on both the NA and Europe tours.

On June 22, 2009, Mike Portnoy announced, on his forum, that there was a lineup change for the Progressive Nation 2009 tour in North America. Pain of Salvation and Beardfish were unable to tour with Dream Theater and Zappa Plays Zappa because of financial troubles within their respective record labels. He also announced two bands that will be filling the vacated slots for the Progressive Nation 2009 tour in North America, Bigelf and Scale The Summit. On this tour Dream Theater has often done an extended jam on Six Degrees of Inner Turbulence's "Solitary Shell," making it around thirteen minutes in length. Similarly, they also did an extended jam on "Surrounded" during the Chaos In Motion tour. In addition, at their show in Toronto, the first encore was a cover of "The Camera Eye", which makes this the third cover of a Rush song performed by the band in concert.

On July 1, 2009, the album debuted at #6 on Billboard's Top 200 album chart, with first week sales totalling 40,285. On November 12, 2009, Mike Portnoy announced that Dream Theater would enter the studio right after New Year's to write and record a brand new instrumental track for inclusion on the God of War III soundtrack EP God of War: Blood & Metal. Titled "Raw Dog", God (of) War reversed, the instrumental was sent to Roadrunner Records January 8, 2010. This marked the first time that the band has written and recorded an exclusive track for an outside project. "Raw Dog" includes the first ever commercially recorded harpejji track, performed by Jordan Rudess.

In December 2009, during their Black Clouds & Silver Linings tour whilst visiting Australia, Dream Theater appeared with one support act, Pain of Salvation. In March 2010, they toured South America with Bigelf. Afterwards, during the summer of 2010, Dream Theater supported Iron Maiden on the US and Canadian legs of their summer tour which were the last shows DT played during 2010.
On Wednesday, September 8, 2010, Mike Portnoy announced he would be leaving Dream Theater.
In his official statement he said:

"Dream Theater was always my baby...and I nurtured that baby every single day and waking moment of my life since 1985...24/7, 365...never taking time off from DT's never-ending responsibilities (even when the band was "off" between cycles)...working overtime and way beyond the call of duty that most sane people ever would do for a band....But I've come to the conclusion that the DT machine was starting to burn me out...and I really needed a break from the band in order to save my relationship with the other members and keep my DT spirit hungry and inspired. "We have been on an endless write/record/tour cycle for almost 20 years now (of which I have overseen EVERY aspect without a break) and while a few months apart from each other here & there over the years has been much needed and helpful, I honestly hoped the band could simply agree with me to taking a bit of a "hiatus" to recharge our batteries and "save me from ourselves"... "Sadly, in discussing this with the guys, they determined they do not share my feelings and have decided to continue without me rather than take a breather...I even offered to do some occasional work throughout 2011 against my initial wishes, but it was not to be..."

The rest of the band did not agree and decided to continue on without him. Because of this decision, Portnoy decided he will be leaving Dream Theater. According to John Petrucci's Twitter account, auditions to find a new drummer were to begin in October. An interview with James LaBrie conducted on October 8, 2010 confirmed that there were seven world-class drummers lined up for auditions, which would be taking place through the rest of October.

Portnoy, who had recently finished recording Avenged Sevenfold's most recent studio album, "Nightmare" in place of their late drummer Jimmy "The Rev" Sullivan, appeared to have an in with Avenged Sevenfold after his departure from Dream Theater. After the members of Avenged Sevenfold decided to continue on without Portnoy, he went back to the members of DT to try to reconcile. Unfortunately, the band had already moved on and any chance of rekindling their working relationship had already passed. Portnoy wrote, “Just for the record, this is indeed true…Fairly recently, I reached out to the guys to try and make amends and offered to reconcile for the sake of having peace back in our lives…(plus I know how much it meant to a lot of the fans…),”. Portnoy also wrote online, “I figured it was still possible to try and save us, because they hadn’t made any announcements yet or begun any public activity with another drummer…but sadly, they declined my offer (well, actually their lawyer did…they didn’t even tell me themselves…)”.

The Addition of Mike Mangini and A Dramatic Turn of Events (2011-Present)

On December 7, 2010 Dream Theater revealed they would headline the High Voltage Festival in Victoria Park, London. On January 3, John Petrucci stated on his Twitter account that Dream Theater entered the studio to begin recording their eleventh album. Two months later, Petrucci posted on his Facebook page that the band had finished writing the next album and would soon begin the tracking process.
On March 17, 2011, John Petrucci announced on his forum page, from his website that the new DT album is moving along. As far as who the new drummer is he commented: "I appreciate everyone's patience regarding the announcement (or lack thereof!) of DT's new drummer. I know it has been very frustrating to have to wait for the news. Believe me, we are busting at the seams to tell everyone and rest assured that our decision will not disappoint on any level!". For the new album he also commented: "As for info and details on the new album, anything such as the title, song names, running times, artwork, direction etc, will be posted on the official DT and Roadrunner sites once the album is complete and we begin to prepare for its release."

On April 21, 2011, the band released a trailer for an upcoming documentary about the search for their new drummer. This trailer revealed the identities of the seven drummers who auditioned; Mike Mangini, Virgil Donati, Marco Minnemann, Peter Wildoer, Thomas Lang, Derek Roddy and Aquiles Priester. On Friday April 29, 2011, Dream Theater revealed over YouTube that they chose Mike Mangini as Portnoy's replacement. Mangini has confirmed that he will not sing Portnoy's vocal parts.
On May 24, 2011, John Petrucci announced that they will be working with legendary producer Andy Wallace for mixing the album.

On June 7, 2011, John Petrucci revealed over Facebook and Twitter that the title of the band's upcoming album will be A Dramatic Turn of Events and will be released via Roadrunner Records on September 13, 2011. A track listing of the new album was revealed on June 8, 2011.
Petrucci announced on June 28 New DT album is all mixed and mastered as of today. First show of the tour in Rome in less than a week! Looking forward to seeing everyone. On June 29, Dream Theater released their latest single, "On the Backs of Angels".