A phenomenon introduced by Mieskuoro Huutajat, a Finnish Male Shouting Choir which was formed in Oulu, Finland in 1987, under the composer/conductor Petri Sirviö. They made their first performance on December 6th of the same year.

The art-form is intended to be slightly tongue-in-cheek and slightly serious, with the participants being dressed as a formal singing choir, but all signs of music are stripped from the songs, and often many of the lyrics are removed too.

The music is then reworked into a form suitable for shouting, with complex rhythmic patterns, and a hint of melody re-added. Many different registers of voice are catered for, from bass to falsetto.

The performance can be quite entertaining, if a little amusing, concentrating on the rhythmic pattern and the facial expressions of the performers.

(Source http://www.huutajat.org/)