SonicMonks

And now, something totally different. In February it's possible to see a horde of finnish men (there's 30 of them) screaming children's ditties, worker's songs, national anthems and quotes from Finnish laws and international treaties, in different concert halls all over Estonia.
I have heard that it's hilarious and really interesting experience for your ears. Even a documentary has been done about them and their unconventional approach to singing. I'm not going to bother with the history of this "choir", read it from their homepage, but just give you two interesting facts:
It's written here that their black ties are made from the inner tubes of car tyres.
They have a habit to perform in unconventional places - for example on an arctic pack ice where the choir - dressed like penguins - performed before the crew of an ice-bound ship.
Go check them out yourself!