When Dream and Day Unite is the debut studio album by American progressive metal band Dream Theater, released on March 6, 1989 through Mechanic/MCA Records. The album is composed mainly of material that originally surfaced during the band's early years as Majesty, and it is the only Dream Theater album to be recorded with their full original lineup that features Charlie Dominici on vocals, as James LaBrie replaced Dominici as the lead vocalist on all subsequent albums.