
1) Composition by Iannis Xenakis
Found on
https://www.crosswordclues.com/clue/pithoprakta

Pithoprakta (1956) is a piece by Iannis Xenakis for 46 string instruments, two trombones, xylophone, and woodblock. Premiered by conductor Hermann Scherchen in Munich on March 1957, the piece was made into a ballet by George Balanchine, Metastaseis and Pithoprakta, along with the earlier Metastaseis. The title translates as `actions through proba....
Found on
http://en.wikipedia.org/wiki/Pithoprakta
No exact match found.