Entered from booking ledger and New York Times concert listing and review. “Who Makes Music.” New York Times [New York, N.Y., United States], 24 Feb. 1974, p. 108. AL. Hughes, Allen. “Recital: Helen Harbison Plays Program for Cello.” New York Times [New York, N.Y., United States], 4 Mar. 1974, p. 39.