2nd and 3rd movements from Chávez's Toccata for Percussion Instruments (1942), for six percussionists.
Commissioned by John Cage for his percussion ensemble in Chicago, originally composed not to be danced but rather as "pure" music. Here it is choreographed by the Italian "modern" dancer/choreographer Liliana Merlo, in 1978. From the video's description on YouTube: "Please, note: the video, even in this case, takes the ballet during the dress rehearsal of the first representation, only for documentation purposes. For this reason, scenic elements on stage are for a different ballet, which have no relevance to the setting of present ballet aesthetic that, on the contrary, included a completely naked scene."
The sound is a little iffy, but it's still fun to watch?