Phyllis Williams, Soprano, and David Williams, Tenor Entered from booking ledger and New York Times concert listing and review. Beyond certain duet selections, it is not known which singer performed which songs. WORLD PREMIERE of Celius Dougherty's SWEET SPRING IS YOUR TIME "CONCERT AND OPERA PROGRAMS OF THE WEEK." New York Times (1923-Current file), Oct 26 1958, p. 1. ProQuest. Web. 2 June 2020. "Sister and Brother in Recital." New York Times (1923-Current file), Nov 02 1958, p. 41. ProQuest. Web. 2 June 2020 joint recital 1958-10-31T20:30:00