 The subsequent world tour included a select few special "album cover" gigs (see Cover songs section, below), in which they played Metallica's "Master of Puppets" and Iron Maiden's "The Number of the Beast" in their entirety.In 2003, Dream Theater entered the studio to write and record another album.Unlike "Scenes from a Memory", which had been written and recorded simultaneously in the studio, the band took a different approach by setting aside three weeks for writing prior to recording.