In the Sinfonía Buenos Aires, Piazzolla's development of symphonic tango is notable for brilliant, original and often complex orchestration. His Bandoneon Concerto, nicknamed "Aconcagua" after the highest Andean mountain, provides the soloist with ample opportunities for drama, pathos and virtuosity. Las Cuatro Estaciones Portenas (The Four Seasons of Buenos Aires), a series of single tango movements with several references to Vivaldi's famous work,...