The Danzas Argentinas (Argentine Dances) are a piano composition by Alberto Ginastera, one of the leading Latin American composers of the 20th century. Written in 1937, they are a set of three dances, and they encompass his Opus 2.
The first piece, Danza del viejo boyero (“Dance of the Old Herdsman”), immediately strikes the ear as being odd. The reason is as simple as it is strange: the left hand plays only black notes, while the right plays only white notes. This means it is composed of two modes (bitonality), the prominent one being E phrygian. Despite the seemingly unavoidable cacophony of that arrangement, Ginastera manages to frame a simple and charming melody through the use of rhythm and texture. The piece ends with a chord (E-A-D-G-B-E), the notes of the open guitar strings in standard tuning. As a result of the criollo influence while looking for an Argentinian language, this was one of Ginastera’s favourite chords. (Wikipedia)
Enjoy this piece. And it's NOT mine, anyway.