Was sind Obertöne? by Christian Bollmann Was sind Obertöne? Christian Bollmann 1K subscribers Erklärungsmodell-Performance von Christian Bollmann im Rahmen eines Konzertes in der Balver Hoehle mit Joachim E.Behrendt. Share this:TwitterFacebookLike this:Like Loading... Related Author: tranquanghai1944 Ethnomusicologist, composer and vietnamese traditional musician View all posts by tranquanghai1944