. "Entered from booking ledger and New York Times concert listing. The event is listed as \"Gretchen Friedman, singer and assisting artists\"; the assisting artists are not identified.\r\n“Arts and Leisure Guide.” New York Times [New York, N.Y., United States], 1 June 1975, p. D3." . . . "Gretchen Friedman, Singer" . . "1975-06-06T20:00:00"^^ .