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Chatting with Billboard, Petrucci commented: "Some initial conversations have already started. There are some song ideas and little things like that - nothing really official, but the seeds just start to get planted.
"One of the great things about this career is that you have the opportunity every time to go in and start again with a blank slate and think, 'What can we do differently? How can we make this better? Where can we go from here?' Every album has a story, and to constantly have a fresh opportunity to do it is really satisfying," the guitarist added.
After discussing the struggle of writing and delivering 20-plus-minute pieces, Petrucci focused on the importance of the band's latest album. "We wanted to establish right away that he was going to be in the studio from day one and involved in everything and we were going to get his influence and his signature on the music," he said.
"That worked out really great, and I think it's evident on the album," John continued. "It took a unified effort to get us to this point; it's always tough when a band member leaves, especially in [Mike Portnoy's] case, who was with us from the beginning. That was a major change in our band, but it happens, right? Band members leave. Band personnel changes.
"But to us it was about how we move forward from that point. Because we approached it in a forward-moving and positive way and had that unified attitude, all the decisions were the right ones, and it's definite a testament to how tight we are as a band, and as friends. We're very happy with the situation now," the guitarist concluded.
Dream Theater are expected to spend most of 2014 out on the road and are planning "a cool event in Boston" that will soon be announced. The band recently also streamed "Metropolis Pt. 1" performance clip off their latest live record "Live at Luna Park." Make sure to give it a listen below.