Mike Portnoy formed a band.
Dream Theater is an American progressive metal band formed in 1985 under the name Majesty by John Petrucci , John Myung , and Mike Portnoy while they attended Berklee College of Music in Boston , Massachusetts . Mike Portnoy . He is also a founding member of Transatlantic , a progressive rock `` super-group '' featuring former Spock 's Beard keyboardist/vocalist Neal Morse , Flower Kings guitarist Roine Stolt and Marillion bassist Pete Trewavas . He is also a founding member of Flying Colors , a progressive pop band also featuring Steve Morse , Neal Morse , Dave LaRue , and Casey McPherson ; and The Winery Dogs , a power trio also featuring bassist Billy Sheehan ( Mr. Big ) and guitarist Richie Kotzen ( formerly of Mr. Big and Poison ) .