German-born Austrian composer (1901-1972), a pupil of Arnold Schonberg.

Autograph note on a post card signed by him, dated 1950, where as president of the Gesellschaft für Neue Musik, Apostel addresses the composer and organist Florian Wiefler, concerning a music performance with the pianist Hans Kann that will take place that evening. Size is 4.1 x 5.8 inches, some smudge over the ink, in very good condition.