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Yes it is a real recording. You can download a software called PaulStretch and try it for yourself.

Heres is an example of The Moonlight Sonata slowed down by 800%. A new world of music awaits.

http://hypermammut.sourceforge.net/paulstretch/

Wow! Love the video as well, the music gives it a sense of profundity, hammers home the reverence we should have for our planet.
Maybe a remix, but a beautiful one if so ;-)
Will definitely check out the software!

I was moved by this. How changing the dynamics of something changes the sense of connection. And highlights what an amazing world we live in!