U.S. Debut Entered from booking ledger and New York Times concert listing and review. U.S. PREMIERE of Vagn Holmboe's STRING QUARTET NO. 1, OP. 46 "THE WEEK'S OPERA AND CONCERT PROGRAMS." New York Times (1923-), Oct 11 1964, p. 1. ProQuest. Web. 10 Jan. 2024. "DANISH ENSEMBLE MAKES DEBUT HERE." New York Times (1923-), Oct 14 1964, p. 53. ProQuest. Web. 10 Jan. 2024.