overtone Singing (canto difonico) – amazing grace – Giovanni Bortoluzzi overtone Singing (canto difonico) – amazing grace – Giovanni Bortoluzzi Giovanni Bortoluzzi Published on Mar 8, 2017 For skype lessons, mail me at: gbort87@gmail.com Canto difonico: “amazing grace”, cantata usando gli armonici naturali della voce, tramite tecnica a doppia cavità. Share this:TwitterFacebookLike this:Like Loading... Related Author: tranquanghai1944 Ethnomusicologist, composer and vietnamese traditional musician View all posts by tranquanghai1944