Dream Theater (often abbreviated to DT) is a progressive metal and rock band, formed by three students at the Berklee College of Music in 1985. In the twenty years since their inception, they have become one of the most successful progressive bands since the height of progressive rock in the mid-1970s, despite being relatively unknown in mainstream pop and mainstream rock circles. Their two highest selling albums are 1992's "Images and Words", which was awarded a gold record and is consistently regarded as a seminal progressive metal release; and 2005's deeply conceptual "Octavarium". Following the line of the conceptual creation of Dream Theater, we have the quartet of albums: Metropolis 2: Scenes From A Memory, Six Degrees Of Inner Turbulence, Train Of Thought and the Octavarium itself. Also we have a quartet (so far) of tracks: "The Glass Prison" (SDOIT), "This Dying Soul" (TOT), "The Root Of All Evil" (Octavarium), and "Repentance" (Systematic Chaos) where by the composition of Portnoy he explains the steps of the alcoholic rehabilitation.
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