Ruth Lorin, Mezzo-Soprano, and John Craig Cooper, Composer-Pianist, with Daniel Gutoff, Piano Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS OF THE WEEK." New York Times (1923-), Apr 10 1960, p. 1. ProQuest. Web. 3 Aug. 2022. Salzman, Eric. "RUTH LORIN, COOPER HEARD WITH GUTOFF." New York Times (1923-), Apr 16 1960, p. 11. ProQuest. Web. 4 Aug. 2022. chamber music performance joint recital 1960-04-15T20:30:00