He has also pursued several other projects, including the Canadian glam rock band Winter Rose, which was popular all around Toronto in the late 1980s. After Dream Theater fired thier former vocalist, Charlie Dominici (who performed on DT's first album "When Dream and Day Unite" - 1989) they hired LaBrie, using his middle name as a stage name to differentiate between Kevin Moore who was the keyboardist in the band when he joined.
James has also appeared on releases by Fates Warning and Shadow Gallery, Trent Gardner's Explorer's Club and Leonardo the Absolute Man, as well as tribute albums to Rush, Emerson Lake and Palmer, and Queen. In 1999, James completed and released the first MullMuzzler album, "Keep it to Yourself" to much critical acclaim. "The followup, James LaBrie's MullMuzzler 2", was released in 2001. James also contributed his vocal talents as a major character on Ayreon's 2004 rock opera, "The Human Equation." His newest record "Elements of Persuasion" was released in 2005.