"Leonid Kogan was unable to perform due to illness; he was replaced by Henryk Szerying.\r\nHughes, Allen. \"HENRYK SZERYNG REPLACES KOGAH: MOSCOW SYMPHONY OFFERS BEETHOVEN VIOLIN CONCERTO.\" New York Times (1923-), 01 Mar. 1969, p. 22. ProQuest. Web. 7 May 2025." . . . . . "symphony orchestra performance" . . . . "Moscow State Symphony" . . . "1969-02-28T20:30:00"^^ .