Lillian Blauvelt, Soprano, and Charles Gregorowitsch, Violin H.M. Hirschberg's Second Sunday "Pop" Concert Note that neither the printed program nor the New York Times review ("Mme. Blauvelt's Concert," Jan. 20, 1902, pg. 7) identify the clarinetist who performed on Schubert's "Der Hirt auf dem Felsen." duo recital 1902-01-19T15:30:00