Dream Theater 
Genre: progressive metal
Formed: 1985
Members: Current members
James LaBrie - Vocals and percussion (1991 - present)
John Petrucci - Guitars and backing vocals (1985 - present)
Mike Portnoy - Drums, percussion and backing vocals (1985 - present)
John Myung - Bass and Chapman Stick (1985 - present)
Jordan Rudess - keyboards, lap steel guitar, and Continuum (1999 - present)
Former members
Chris Collins - Vocals (1986)
Charlie Dominici - Vocals (1987- 1990)
Kevin Moore - Keyboards (1986-1994)
Derek Sherinian - Keyboards (1995-1999)
Discography When Dream and Day Unite (1989)
Images and Words First (1992)
Awake (1994)
A Change of Seasons (EP) (1995)
Falling into Infinity. (1997)
Metropolis Pt 2: Scenes from a Memory (1999)
Six Degrees of Inner Turbulence. (2002)
Train of Thought (2003)
Octavarium (2005)