Roomet Jakapi is a vocalist and improviser based in Tallinn. He has performed with Emilio Gordoa, Louise Dam Eckardt Jensen, Fred Frith, Jerzy Mazzoll, Sławek Janicki, Gintas K, Taavi Kerikmäe, Mart Soo, Ensemble U:, Repoo Ensemble, LAKi, and many other musicians and groups.

Lauri Hyvärinen is a guitar player from Helsinki. For most of his life he has concentrated on experimental and improvised music as well as noise. He works to find a balance between an instrumental impulse and a respect for silence and presence. Besides his solo ventures Hyvärinen has played with musicians such as Ilia Belorukov, Hong Chulki, Tommi Keränen, Jone Takamäki, Alan Wilkinson, Jack Wright, Morishige Yasumune and Naoto Yamagishi. Hyvärinen has performed widely in Europe, Japan, Russia and the Baltics.

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.