Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS FOR THE WEEK." New York Times (1923-Current file), Jan 27 1957, p. 1. ProQuest. Web. 4 May 2021. "Maeda and Uni Sprengling Perform." New York Times (1923-Current file), Jan 29 1957, p. 25. ProQuest. Web. 6 May 2021.
Maeda Sprengling, Soprano, and Uni Sprengling, Violin