. . . "choir performance" . . "Entered from booking ledger and New York Times concert listing.\r\n\"Entertainment Events.\" New York Times (1923-), Jun 12 1968, p. 36. ProQuest. Web. 13 Jan. 2025." . . "1968-06-12T20:00:00"^^ . . "Masterwork Music and Art Foundation Seminar-Sing" .