Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS FOR THE WEEK: OPERA METROPOLITAN CONCERTS RECITALS TODAY." New York Times (1923-Current file), Mar 03 1957, p. 114. ProQuest. Web. 14 May 2021. "Janusz Plays Violin Works." New York Times (1923-Current file), Mar 04 1957, p. 24. ProQuest. Web. 14 May 2021.