the crowd in a stunning uproar. Since that time, the band has played individual gigs throughout the Chicago area and headlined metal festivals in Europe and the U.S. while working on a new album. A concert in Stockholm, Sweden in 2005 produced the live DVD "Trouble – Live in Stockholm" with members Eric Wagner, Rick Wartell, Bruce Franklin, Jeff Olson, and Chuck Robinson. In February 2004, Dave Grohl of Nirvana and the Foo Fighters released a tribute album that paid homage to his metal roots. Entitled Probot, the disc featured various vocalists, including Eric Wagner, who sang on the track "My Tortured Soul". In the album's liner notes, Grohl wrote that buying Psalm 9 was like buying Sgt. Pepper's Lonely Hearts Club Band. Holzner left the band soon after, to be replaced by Chuck Robinson, who played on the band's newest studio album, Simple Mind Condition, which was released in Europe on April 3, 2007, by Escapi Music. The band toured internationally in support of its release, but were not able to secure a U.S. release date for the album until over two years later. An unplugged album was later released through the band's website and, more recently, Escapi Music. New singers and The Distortion Field (2008–present) In May 2008, it was announced that Eric Wagner has left the band and had been replaced by Kory Clarke of Warrior Soul. Jeff Olson also announced his departure from the band in July 2008 to continue with his own band, Retro Grave. Olson's last show with Trouble was, coincidentally, at a rock club called, "The End" in Memphis, Tenn. Olson was replaced by Wet Animal's Mark Lira for the band's upcoming U.S. East Coast tour. In a September 2008 interview with Rock N Roll Experience, guitarist Rick Wartell mentioned that Trouble had written "eight or nine songs" for their next album, and would begin recording it after touring. When asked which direction is the new music going in, Wartell replied, "I know people have said this a million times and I know you've heard this a million times, but it's pretty fucking heavy, let's put it that way! The music end of it that Bruce [Franklin, guitar] and I are writing is getting heavier and heavier...it's getting heavier, and then we want Kory to incorporate his style into what we are doing, that's basically all that we really want out of this."