On May 12, 2006, Martin Lopez announced that he had officially parted ways with Opeth due to health problems, and he was replaced by Martin Axenrot. Opeth toured on the main stage of Gigantour in 2006, alongside Megadeth. "Ghost Reveries" was re-released on October 31, 2006, with a bonus cover version of Deep Purple's "Soldier of Fortune" and a DVD of the making of the album. A recording of Opeth's live performance at the Camden Roundhouse, in London, on November 9, 2006, was later released as the double live album "The Roundhouse Tapes". On May 17, 2007, Peter Lindgren stated he was leaving Opeth after 16 years. "The decision has been the toughest I've ever made but it is the right one to make at this point in my life," Lindgren said. "I feel that I simply have lost some of the enthusiasm and inspiration needed to participate in a band that has grown from a few guys playing the music we love to a worldwide industry." Ex-Arch Enemy guitarist Fredrik Åkesson replaced Lindgren, as Åkerfeldt explained, "Fredrik was the only name that popped up thinking about a replacement for Peter. In my opinion he's one of the top three guitar players out of Sweden. We all get along great as we've known each other for maybe four years and he already has the experience to take on the circus-like lifestyle we lead as members of Opeth."