Here's how it sounds like:
https://youtu.be/yNi0bukYRnA?si=NnmGMBIkHRybmt0q
Here's the Shanghai one:
https://www.youtube.com/watch?v=YGCp4PPaRSg
Reminds me of Xenakis Duel and Strategy. Very avant garde
They seem to be from the same era, although Xenakis works are a couple of years younger
Cue RIIR in...