(Tiny bit of background information, this was done by supporters of one of the Finnish presidential candidates, although he himself had nothing to do with this.)
After hearing this, many people shall flock to Finland and live there in the hopes of becoming part of one of these every day. Maybe that was the plan of the Finnish all along... So...essentially..they were all trying to.. Spoiler [video=youtube;_hHDxlm66dE]http://www.youtube.com/watch?v=_hHDxlm66dE[/video]
That was pretty impressive. I liked it. There's also this one: [video=youtube;SXh7JR9oKVE]http://www.youtube.com/watch?v=SXh7JR9oKVE[/video]
I think it's the Hallelujah chorus. Speaking of which, here's another fun one. [video=youtube;jci6yQ7t8W4]http://www.youtube.com/watch?v=jci6yQ7t8W4[/video]
Finlandia. It was originally a symphony(iirc) by Jean Sibelius, and a part of the melody was adapted into a choral version at some point.