Rain

Check this out. Open up this first link and let the sounds play.

http://www.rainymood.com/

Meditative, relaxing, yeah? Now play some music over top of it. Just a few recommendations (open in a new tab):

http://www.youtube.com/watch?v=WEeuetOsxKg
http://www.youtube.com/watch?v=f9GH-yvPHSY
http://www.youtube.com/watch?v=xbJQT2eDseA (makes so much sense, right?)
http://www.youtube.com/watch?v=-RpzAJvVrxM
http://www.youtube.com/watch?v=YTdCzIduUb4
http://www.youtube.com/watch?v=5Z8oYH_bhnA (or if you can find their song U Ba Khin)