. "1957-02-10T17:30:00"^^ . "Chamber Music Circle Concert" . . "Entered from booking ledger and New York Times concert listing and review.\r\n\"CONCERT AND OPERA PROGRAMS FOR THE WEEK.\" New York Times (1923-Current file), Feb 10 1957, p. 126. ProQuest. Web. 11 May 2021.\r\n\"CHAMBER CONCERT FEATURES SINGER: FLORENCE KOPLEFF EXCELS IN RARELY HEARD BRAHMS SONGS FOR ALTO AND VIOLA.\" New York Times (1923-Current file), Feb 11 1957, p. 34. ProQuest. Web. 11 May 2021." . . . "chamber music performance" . . . .