New York Debut | All-Chopin Program Entered from booking ledger and New York Times concert listing and review. The listing identifies one of the waltzes as "C minor (Op. post.)"; this presumably referred to either the A minor or E minor op. post. waltzes. “Who Makes Music.” New York Times [New York, N.Y., United States], 7 May 1972, p. D18. ARTS AND LEISURE. Hughes, Allen. “Chopin Fills Debut of Polish Pianist.” New York Times [New York, N.Y., United States], 15 May 1972, p. 44. ProQuest.