Dream Theater je američki progressive metal bend kojeg su 1986. osnovali John Myung, John Petrucci i Mike Portnoy (pod imenom Majesty), dok su pohađali Berkley College of Music u Bostonu. Unatoč promjenama u postavi benda, tri osnivača su se zadržala u bendu do danas.
Postali su popularan progressive bend u Europi, unatoč opadanju popularnosti toga žanra od sredine 70-ih. Iako su imali nekoliko popularnih hitova, većinom su ostali underground bend (u SAD-u).
Bend je poznat po tehničkoj vještini svojih glazbenika, koji su osvojili mnoge glazbene nagrade te surađivali sa mnogim značajnim glazbenicima.
John Petrucci je 6 puta bio treći gitarist na G3 turneji, više nego ijedan drugi gitarist, slijedeći stope Erica Johnsona, Roberta Frippa i Yngwiea Malmsteena.
*Trenutna postava:
James LaBrie - lead vocals, percussion, keyboards[34] (1991-present)
John Myung - bass, chapman stick (1985-present)
John Petrucci - guitar, backing vocals (1985-present)
Mike Portnoy - drums, percussion, vocals (1985-present)
Jordan Rudess - keyboards, continuum, lap steel guitar (1999-present)
*Diskografija:
1989: When Dream and Day Unite
1992: Images and Words
1994: Awake
1995: A Change Of Seasons
1997: Falling into Infinity
1999: Metropolis Pt. 2: Scenes from a Memory
2002: Six Degrees of Inner Turbulence
2003: Train of Thought
2005: Octavarium
2007: Systematic Chaos
http://www.metal-archives.com/band.php?id=37http://en.wikipedia.org/wiki/Dream_Theaterhttp://www.dreamtheater.net/http://www.myspace.com/dreamtheater