Nature music?

I’ll be heading on a flight tomorrow, and I just realized that it’s going to be a very long one. Seeing as how I’ll be falling asleep at some point (Or if I want to relax), I figured having a few mp3’s of any nature songs (You know, rain sounds, bird chirp sounds, etc.) would be ideal.
Now granted I don’t know the proper term for it. Nature Ambience maybe? It’s just those natural nature sounds that help you sleep or relax. I was wondering where I could obtain such things?
Answer #1
Search the music section for Nature or relaxation and you will find them
Edit:
Most links in the music section are dead but I found some, check the below link
http://archive.org/details/Sounds_of_Nature_Collection
Answer #2
Check this thread:
http://www.google.com?t=1582294
Answer #3
Although not nature music, but I’d suggest you hit up ‘Lanterna’,’Enigma’ or ‘Moby’ on the youtube for some nice chilling music!
Answer #4
CCheck here, relaxing music, all types, FREE!
http://www.purple-planet.com/