The Journal of the Arnold Schoenberg Center presents selected papers of the symposium held at the Arnold Schönberg Center in Vienna in October 2019 as well as free submissions on Arnold Schönberg and topics related to him. A special focus was a one-day roundtable on sketching in the works of Arnold Schoenberg, Anton Webern, and Alban Berg on the threshold of atonality and during the transition to twelve-tone composing.