Morganist, I know your thread is "composers", but listen to this passion with classical sound. Of the different time. http://www.youtube.com/watch?v=narrCWt02Zo
I find anything by Chopin to be really relaxing. But another great composer that probably isn't that well recognized, except in the video game world, would be Nobuo Uematsu. He does all the music for Square/Enix RPG games, like Final Fantasy. http://www.youtube.com/watch?v=Yn71hIsm0U8