The four bands last came together at Yankee Stadium, New York in 2011 and in an interview with Kaaos TV, the metal veteran says while it would be good to hook up again, it shouldn't become a regular event as there has to be "something special" about the occasion.

"I'm open to playing and I don't really care who I play with," he says. "We had fun and it's important the fans have a good time. It would be great to do it some more, but there's also the beauty of it being something special and not doing it everywhere.