Passage: In 2004, Lee claimed to be working on music for The Chronicles of Narnia: The Lion, the Witch and the Wardrobe, but that the music was rejected by the studio for being "too dark". However, the producers of Narnia stated that Lee was never asked to compose any music for the film, whose score was written by Harry Gregson-Williams, and that "No Evanescence music was planned for the soundtrack." While there was some speculation that one of the supposed songs had been cut and used in several tracks of The Open Door, Lee stated this was not true except for part of it being used to segue into the last track of the album, "Good Enough".Lee became the American chairperson for Out of the Shadows in 2006. This organization is an international foundation with the goal of providing education about epilepsy. Lee's younger brother, Robby, was previously diagnosed with this condition. The singer also made a brief guest appearance in the music video for Johnny Cash's "God's Gonna Cut You Down" in late 2006. As each celebrity featured in the shoot was allowed to choose what they would be doing for the video, Lee chose to appear laying flowers on a grave. Her scene was recorded at Trinity Church in Manhattan, during which she wore a black velvet coat that previously belonged to Tim Burton.In February 2007, MTV released MTV Unplugged: Korn to television and radio, in which Lee is featured during the song "Freak on a Leash". The song was also released as the first single from the album. In November 2007, VH1 produced a mockumentary in the style of Behind the Music, titled Rock Band Cometh: The Rock Band Band Story, to promote the video game Rock Band. Lee was one of the celebrity cameos featured on the show.

Question: Johnny Cash had a guest appearance in his song in what year?
2006