Ambient, noise, calm and moving. If you haven't heard of Basinski, please check him out. His Disintegration Loops, a series of literally disintegrating loop-tapes, is so dreamy, it's almost scary. Another even calmer work is watermusic I and watermusic II, as well as Silent Night.

He put out too much to post it all here. It's all in a similar vein, so feel free to give it a long try.

Anyway, tomorrow he will release another work of his and I am super excited to have a listen.