"William Stone, Violin, and Mathilde McKinney, Piano" . "New York Debut\r\nEntered from booking ledger and New York Times concert listing and review.\r\n\"OPERA REPERTORY, SYMPHONY AND CONCERT PROGRAMS FOR THE COMING WEEK IN NEW YORK.\" New York Times (1923-Current file), Mar 31 1957, p. 130. ProQuest. Web. 8 June 2021.\r\n\"Violin and Piano Team.\" New York Times (1923-Current file), Apr 02 1957, p. 38. ProQuest. Web. 8 June 2021." . . . . "1957-04-01T20:30:00"^^ . . . "duo recital" . . .