At the beginning of his career, he conducted a lot of modern music. But gradually he began to concentrate on the great composers, in particular Bruckner, but also Beethoven. At the time of his death, he was considered one of the last representatives of the Austro-Germanic tradition.Autograph letter signed Genève, 24.05.1946 to Paul Langer :"...je vous prie de vouloir accepter aimablement la photo ci-incluse signée..."; Signed printed photograph applied to cardboard in-16 with autograph dedication signed at the verso date 1946. 1 p in-4.