"Entered from booking ledger and New York Times concert listing.\r\n\"CONCERT AND OPERA PROGRAMS OF THE WEEK.\" New York Times (1923-Current file), Mar 29 1959, p. 1. ProQuest. Web. 21 July 2020." . . "chamber music performance" . . . . . . "1959-03-31T20:30:00"^^ . "Contemporary Music Concert by the New York Composers Laboratory" . . .