. . "Entered from listings in the New York Tribune (\"Calendar for the Current Week\", columns 2-3) and New York Times, and New York Times review. Stated time is approximate.\r\n\"A CALENDAR OF CONCERTS.\" New York Times (1857-1922), Nov 12 1911, p. 1. ProQuest. Web. 24 Feb. 2022.\r\n\"Mme. Hamaker-Heyne's Concert.\" New York Times (1857-1922), Nov 16 1911, p. 9. ProQuest. Web. 24 Feb. 2022." . . . "1911-11-15T20:00:00"^^ . . . . . . "joint recital" . "Mme. Hamaker-Heyne, Soprano, with Hermann Martonne, Violin, Paul Kéfer, Cello, and Emmanuel P. Mesthene, Flute" .