POST HORN is Raul Keller’s and Hello Upan’s free improvisational duo, which focuses on experimentality, sound and noise research. Keller and Upan have been improvising together in different constellations since 2000. In 2004 they recorded Projekt Unison ‘DOHC’ with Heikki Tikas (BF, MKDK) and this was a start of their noise experiments. Since 2006 they have collaborated with Katrin Essenson as LokaalRaadio, they continue making experimental radio shows under this name. Keller and Upan have been giving concerts as a duo or with different free improvisation and experimental sound groups in Finland, Lithuania, Poland, Germany and Brazil.

Improtest is concert series that brings improvisational music from local and foreign authors to local audience. The concerts have been taking place since 2005 once a month.