"Entered from booking ledger and New York Times concert listing and review.\r\n\"Who Makes Music and Where: METROPOLITAN OPERA.\" New York Times (1923-), 18 Jan. 1970, p. 95. ProQuest. Web. 25 June 2025.\r\nHenahan, Donal. \"Weilerstein and Halligan Play Ives Sonata with Native Grace.\" New York Times (1923-), 20 Jan. 1970, p. 46. ProQuest. Web. 25 June 2025." . . . "duo recital" . "Donald Weilerstein, Violin, and Susan Halligan, Piano" . . . . . "1970-01-19T20:30:00"^^ . .