Ástor Pantaleón Piazzolla (March 11, 1921 – July 4, 1992) was an Argentine tango composer an bandoneón player. His oeuvre revolutionized the traditional tango into a new style termed nuevo tango, incorporating elements from jazz and classical music. He is therefore widely considered the most important tango composer of the latter half of the twentieth century. A formidable bandoneonist, he regularly performed his own compositions with different ensembles. He is known in his native land as "El Gran Ástor" ("The Great Astor").