Edit: I forgot to mention nine tracks are available as FREE downloads with the 40 page pdf file. You can't beat free music. But, you have to purchase physical media for the 24/96 versions :-|
Trent Reznor explains, "I've been considering and wanting to make this kind of record for years, but by its very nature it wouldn't have made sense until this point. This collection of music is the result of working from a very visual perspective - dressing imagined locations and scenarios with sound and texture; a soundtrack for daydreams. I'm very pleased with the result and the ability to present it directly to you without interference. I hope you enjoy the first four volumes of Ghosts."
Here is the link Nine Inch Nails | Ghosts I - IV.