A series of tubes made this possible?

So, someone posted this on Tumblr, and I don’t really know what to say other than you have to see it.

And here’s the whole piece featuring 1752 singers performing 2052 parts, from 58 countries:

I realise it’s way past my bedtime, but this is worth sharing.
This is why the Internet is awesome.

Definitely interested in more of this music.
Thanks for sharing, Brian. :-)