Riverside Chamber Singers Entered from booking ledger, New York Times concert listing and review, and 1/16/1961 Riverside Chamber Singers program. The review seems to indicate that this concert repeated the program from 1/16/1961; no indication could be found that the earlier performance was cancelled or postponed. "CONCERT AND OPERA PROGRAMS THIS WEEK." New York Times (1923-), Jan 29 1961, p. 1. ProQuest. Web. 12 Sep. 2022. Ericson, Raymond. "Music: Chamber Singers: Riverside Ensemble Gives A Cappella Program in Carnegie Recital Hall." New York Times (1923-), Feb 03 1961, p. 16. ProQuest. Web. 13 Sep. 2022. choir performance 1961-02-02T20:30:00