 In addition was the unexpected appearance of fellow musicians Russell Allen (Symphony X vocalist), Burton C. Bell (Fear Factory vocalist) and Dave Mustaine (Megadeth vocalist/guitarist), who joined the band on stage to perform parts of the song.Dream Theater later departed from Gigantour 2005 a few dates before it ended and continued on with their own series of concerts, several of which were recorded and released for the band's fanclubs.The 20th anniversary tour concluded with a show at Radio City Music Hall in New York City on April 1, 2006.