. "John Andrew Sonneborn, Piano" . . . "1966-05-21T17:30:00"^^ . "New York Debut\r\nEntered from booking ledger and New York Times concert listing and review.\r\n\"Who Makes Music and Where.\" New York Times (1923-), May 15 1966, p. 1. ProQuest. Web. 9 Sep. 2024.\r\n\"Sonneborn in Piano Debut at Carnegie Recital Hall.\" New York Times (1923-), May 22 1966, p. 61. ProQuest. Web. 10 Sep. 2024." . . . . . . . . "solo recital" . . . . . .