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XM Satellite Radio will broadcast select XM music channels in 5.1 Surround Sound, marking the first time that a radio company has broadcast in 5.1 Surround Sound twenty-four hours a day
http://www.southgatearc.org/news/december2005/xm_surround_sound.htm
http://www.southgatearc.org/news/december2005/xm_surround_sound.htm