League/ISCM Concert: The Continuing Avant-Garde: Elliott Carter's 60th Birthday Concert Presented in association with League-ISCM and the Fromm Music Foundation Entered from booking ledger and New York Times concert listing and review. The New York Times. “TimesMachine: Sunday February 16, 1969 - NYTimes.Com.” Accessed May 6, 2025. https://timesmachine.nytimes.com/timesmachine/1969/02/16/issue.html. Henahan, Donal. "Elliott Carter has a Birthday; Right Notes Hit on Wrong Date." New York Times (1923-), 17 Feb. 1969, p. 31. ProQuest. Web. 6 May 2025. chamber music performance 1969-02-16T20:30:00