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| IGNM-Fest, Salzburg 1923: Alban Berg with the Havemann Quartet (Havemann, Kniestädt, Mahlke, Steiner - all four in dark suits); also (from left) Karl Horwitz, Josef Schmidt and Fritz Kaltenborn (Schönberg School). |  |
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 The quartet performed Beethoven's Ninth on Feb. 19, 1933 in Berlin. |