Astor Pantaleón Piazzolla (March 11, 1921 – July 4, 1992) was an Argentine tango composer, bandoneon player, and arranger. His oeuvre revolutionized the traditional tango into a new style termed nuevo tango, incorporating elements from jazz and classical music. A virtuoso bandoneonist, he regularly performed his own compositions with a variety of ensembles.
Piazzolla's nuevo tango was distinct from the traditional tango in its incorporation of elements of jazz, its use of extended harmonies and dissonance, its use of counterpoint, and its ventures into extended compositional forms. Despite the prevalence of the quintet formation and the ABABC compositional structure, Piazzolla consistently experimented with other musical forms and instrumental combinations.