Tango: Zero Hour (Nuevo Tango: Hora Cero in Spanish [often erroneously Hora Zero]) is an album by Ástor Piazzolla and his Quinteto Nuevo Tango (in English: New Tango Quintet, often loosely referred to as his second quintet). It was released in September 1986 on American Clavé, and re-released on Pangaea Records in 1988.Piazzolla considered this his greatest album.