Waltteri Petri Hienonen Helsinki Waltteri a dj/producer of techno. Waltteri has an extensive history with electronic music. He has Djing and produced several different styles of music for more than a decade. Nowadays his main focus is techno. Proud member of Friendship & Decadence Label and Häiriö crew. In recent years Waltteri has been spreading his love for music both in domestic and international parties. Ruthless, tense and throbbing techno is the name of the game.