. . . "Entered from program calendar and New York Times concert listing and review.\r\n\"Concert and Opera Programs of the Week.\" New York Times (1923-Current file): 1. Feb 15 1953. ProQuest. Web. 20 Aug. 2014.\r\n\"Twins in Song Recital.\" New York Times (1923-Current file): 18. Feb 16 1953. ProQuest. Web. 20 Aug. 2014." . . . . . . . "Ann and Bets Gantvoort, Sopranos" . "1953-02-15T14:30:00"^^ . . . . . . "joint recital" . . . .