There was a good theremin performance at the Interaction SF-Worldcon in Glasgow. Unfortunately, I forgot the name of the theremin player, but she did very well. She used a black Moog etherwave theremin. She played in her own style and there were two instruments (Theremin and keyboard.)
I made some viedo clips and photos and hope to find the name.
Another good thing, I found other theremin fans there.
Best regards
Bernd