Riverside Chamber Singers Entered from program calendars, booking ledger, and New York Times concert listing and review. NEW YORK PREMIERE of Maurice Duruflé's QUATRE MOTETS SUR DES THÈMES GRÉGORIENS, OP. 10 NEW YORK PREMIERE of Lou Rodgers' THREE CHINESE POEMS "CONCERT AND OPERA PROGRAMS." New York Times (1923-Current file), Dec 17 1961, p. 1. ProQuest. Web. 30 Oct. 2019. "CHAMBER SINGERS PRESENT PROGRAM: RIVERSIDE GROUP IN CONCERT AT CARNEGIE RECITAL HALL." New York Times (1923-Current file), Dec 19 1961, p. 40. ProQuest. Web. 30 Oct. 2019. choir performance 1961-12-18T20:30:00