Hans Knappertsbusch
Other conductors who worked with the orchestra in the mid-1930s before the Anschluss included Arturo Toscanini, Weingartner, Hans Knappertsbusch, Otto Klemperer, Adrian Boult, Victor de Sabata and George Szell. Walter conducted the last concert before the Anschluss, on 20 February 1938, featuring the world premiere of Egon Wellesz's "Prosperos Beschwörungen" and Anton Bruckner's Symphony No. 4.