I remember my teacher letting us listen to animusic in class. It's music created digitally and uses really random ways to make it. It's very beautiful.
http://www.youtube.com/watch?v=hyCIpKAIFyo <-- Pipe Dream
http://www.youtube.com/watch?v=Cgt4DEBQy50 <-- Aqua Harp (pretty nighttime music)
http://www.youtube.com/watch?v=lQso49UOW84&feature=related <-- Heavy Lights
http://www.youtube.com/watch?v=OROAGNbsikQ&feature=relmfu <-- Acoustic Curves
http://www.youtube.com/watch?v=hmZUj2oMp74&feature=relmfu <-- Fiber Bundles
There are a lot more than these, these are just the most popular ones. Feel free to post more if you find them :3