Sonja Kornfeld Posted byWebmaster February 13, 2016March 20, 2024 No photo. Sonja Kornfeld. Profession: Singer. Relation to Mahler: Worked with Gustav Mahler. Correspondence with Mahler: Born: Unknown. Died: Unknown. Buried: Unknown. 1895 Concert Hamburg 12-04-1895. If you have found any errors or text needing citation, please notify us by selecting that text and pressing Ctrl+Enter. Related posts: Stadttheater Gustav Mahler’s Legacy Gustav Mahler-Alfred Rosé Collection – Inventory Wilhelm Zinne (1858-1934) Mahler Festival 1920 Amsterdam 1895 Concert Hamburg 12-04-1895