The fourtieth classical recording: #947 Einojuhani Rautavaara - Cantus Arcticus
Here's another modern classical pieces making use of recorded sounds, after Different Trains, and the mood it creates couldn't be more different. Including recorded bird song, this, more than ever, gives you the feeling of walking through nature filled with birds that take priority over the instruments. In the first movement it creates a setting, a slow trod that suits the walk through a bog. It changes a bit in the second, as Melancholy has some clearer instruments in places that build it up a bit more, while the third movement moves towards being mostly instrumental, with bird sounds in the background filling the music.
It's interesting to hear these new sounds mixed in, especially as music so often tries to imitate nature. Here it embraces the natural sound and builds around it, which is just as succesful at creating that atmosphere of nature.