Entered from booking ledger and New York Times concert listing and review. The correct program order is uncertain. "Who Makes Music and Where." New York Times (1923-), 13 Apr. 1969, p. 1. ProQuest. Web. 13 May 2025. Henahan, Donal. "Ko Iwasaki, Cellist, and Sister, Shuku, Pianist, in Sonata Recital." New York Times (1923-), 15 Apr. 1969, p. 42. ProQuest. Web. 13 May 2025.
Ko Iwasaki, Cello, and Shuku Iwasaki, Piano