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), Dec 16 1956, p. 1. ProQuest. Web. 22 Apr. 2021. "Music: Works by Kouguell." New York Times (1923-Current file), Dec 17 1956, p. 34. ProQuest. Web. 22 Apr. 2021