"joint recital" . "Entered from booking ledger and New York Times concert listing.\r\n\"Who Makes Music and Where.\" New York Times (1923-), 01 Mar. 1970, p. 105. ProQuest. Web. 22 July 2025." . "Susan Ketteman, Soprano, John Seabury, Bass-Baritone, and Ernst Wolff, Piano" . . . . . . . "1970-03-05T20:30:00"^^ . . . .