Mack Harrell, Baritone, and Sergius Kagen, Composer-Pianist Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS FOR THE WEEK." New York Times (1923-Current file), Apr 29 1956, p. 137. ProQuest. Web. 16 Mar. 2021. Parmenter, Ross. "Music: Mack Harrell Gives Recital: Baritone's Program is Tribute to Friedberg Francescatti is Heard Jazz by Erroll Garner Songs by Kagen among Compositions Heard Marco Sorisio Sings." New York Times (1923-Current file), Apr 30 1956, p. 18. ProQuest. Web. 17 Mar. 2021. duo recital tribute 1956-04-29T17:30:00