Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where: METROPOLITAN OPERA." New York Times (1923-), Nov 20 1966, p. 1. ProQuest. Web. 18 Sep. 2024. "COPENHAGEN STRINGS RETURN FOR RECITAL." New York Times (1923-), Nov 27 1966, p. 86. ProQuest. Web. 18 Sep. 2024.