Dr. Emil Schipper the famous Heldenbariton ; the complete recordings - Schipper, Emil 1882-1957; Olszewska, Maria 1892-1969; Boschetti, Victor 1871-1933; Günther, Felix 1886-1951; Németh, Mária 1897-1967; Alwin, Karl 1891-1945; Grosse, Kurt 1890- (Lebendige Vergangenheit, 1995)