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Dream Theater is a Progressive Metal band from Long Island, New York. It was formed originally as "Majesty" by their three core members Mike Portnoy, John Petrucci and John Myung, the latter two of which have remained with the band since its inception in 1985.

Current Line-Up John Petrucci - Guitars, backing vocals (1985-present) John Myung - Bass (1985-present) James LaBrie - Lead vocals (1991-present) Jordan Rudess - Piano, keyboards (1999-present) Mike Portnoy - Drums, percussion, backing vocals (1985-2010, 2023-present)

Former Members Mike Mangini - Drums, percussion (2010-2023) Derek Sherinian - Piano, keyboards (1995-1999) Kevin Moore - Piano, keyboards (1986-1994) Steve Stone - Lead vocals (1990) Chris Cintron - Lead vocals (Sometime between June 1990 and January 1991) Charlie Dominici - Lead vocals (1987-1989, died 2023) Chris Collins - Lead vocals (1986)