"Entered from New York Times concert listing; the performers are not named.\r\n\"WEEK'S OPERA AND CONCERTS.\" New York Times (1923-), Mar 15 1964, p. 1. ProQuest. Web. 10 Nov. 2023." . . . "Concert Production of Rigoletto" . . "1964-03-16T20:00:00"^^ . . .