Last month, drummer Mike Mangini said the ambitious 34-track concept album blew his mind while they were laying down tracks in the studio. He said: "John Petrucci put together the whole thing, and he organized it in a really amazing way. And then he used our keyboard player, Jordan Rudess.

"When he plays, you see a landscape - you've got a picture in your mind. It's so visual, it's unbelievable. There really is nobody better to help bring a story to life, so you feel it and see it. It's not something I do on my instrument. So when I experience it, it blows my mind."