2, is a set of three dances for solo piano written in 1937 by Alberto Ginastera, one of the leading Latin American composers of the 20th century.
Ginastera makes use of gratuitous dissonance in this piece, opening it with a 12-tone ostinato and frequently using minor seconds to harmonize otherwise simple melodies.
The jubilant sound of the C section is achieved by harmonising every single melody note with a major chord, even if they are totally foreign to the tonic key.
The D section, by contrast, does not use a single accidental; here, jubilance is expressed through the use of brisk tempo, strong rhythm, fortissimo, and a simple, majestic chord progression.
As might be expected from the savageness of the rest of the piece, the coda is anything but subtle: ffff dynamics and a tremendous glissando that brings the dance to a close.