 The first disc consisted of five tracks of 7–13 minutes in length, and the second disc was devoted entirely to the 42-minute title track, which remains to date the longest song Dream Theater has written.Many of the song's melodies and musical themes originated in an instrumental piece, written by Rudess, which would eventually become the song's "Overture".Those themes were then expanded by the rest of the band to form individual chapters in a complete story.