Entered from booking ledger and New York Times concert listing and review. “Theater: Arts and Leisure Guide.” New York Times [New York, N.Y., United States], 2 Nov. 1975, p. 139. Arts & Leisure. Sherman, Robert. “Piano Recital Given by Guardarramas.” New York Times [New York, N.Y., United States], 9 Nov. 1975, p. 68.