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Trent Reznor has released a series of songs in a album called Ghosts I-IV. I must say these are some awesome, high quality tracks and they are free of vocal, and very chilled and laid back tracks. They almost border on trance music. This album is freely downloadable on http://www.nin.com/ &
http://ghosts.nin.com/ & http://thepiratebay.org/tor/4059158/Nine_Inch_Nails_-_Ghosts_I_(2008) It is definitely worth the download.