Entered from program calendar, advertisement in 4/6/1951 program, and New York Times concert listing and review. "Opera and Concert Programs of the Week." New York Times (1923-Current file): 102. Apr 08 1951. ProQuest. Web. 12 Dec. 2013. "Concert Debut Here By Canadian Pianist." New York Times (1923-Current file): 29. Apr 09 1951. ProQuest. Web. 12 Dec. 2013. NEW YORK PREMIERE of William Spielter's GUARACHA MEXICANA