Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS OF THE WEEK." New York Times (1923-Current file), Feb 15 1959, p. 1. ProQuest. Web. 18 June 2020. "HALVORSEN IN RECITAL: BARITONE OFFERS PROGRAM AT CARNEGIE RECITAL HALL." New York Times (1923-Current file), Feb 17 1959, p. 28. ProQuest. Web. 18 June 2020.