Entered from booking ledger and New York Times concert listing and review. According to the listing, and unidentified string quartet also performed. "CONCERT AND OPERA PROGRAMS OF THE WEEK." New York Times (1923-), May 08 1960, p. 1. ProQuest. Web. 10 Aug. 2022. "Federation Choral Heard." New York Times (1923-), May 11 1960, p. 45. ProQuest. Web. 10 Aug. 2022.