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...