have u ever listened Drone music?
it s an old type of music coming from traditional indian music that gets a lil attention since the 60ies
it s major figures are Terry Riley, La Monte Young, the theater of eternal music...
and more recent ones like experimental audio research, streams of europe...
it s really good to chill out, u should try
http://www.youtube.com/watch?v=QeLcrxhkTuE&feature=related