Entered from booking ledger and New York Times concert listing. Note that the Times incorrectly lists the venue of this performance as Town Hall. Lilla St. John is identified as "guest piano soloist", so it is assumed Ivan Costello's accompanist was another (unnamed) pianist. "CONCERT AND OPERA PROGRAMS FOR THE WEEK." New York Times (1923-Current file), Jan 06 1957, p. 1. ProQuest. Web. 27 Apr. 2021.