Tomi Koivusaari (Amorphis) has shared an official video for “Värinvaihtaja” from his Bjørkø project. The track, which features Ismo Alanko, appears on the guitarist’s latest album “Heartrot.” Koivusaari commented: “The working title for the song was already ‘Siekkarit’ (short for Sielun Veljet) so it was obvious who to invite as a guest vocalist. Initially, as…