I thought I had posted this before but it didn’t take. Anyway, I did 3 audience events for TheatreWorks last week, and at one of them, I met a woman who had directed a production of ANTIGONE with an improvised chorus in it.
Yes! That is, the chorus improvised different movements every night, and the lines were not assigned. It had 3 people in it.
She studied at NYU and ART in the 70s and used Viewpoints methods to develop a movement vocabulary for the chorus.
Needless to say, I was very happy to have heard this. Precedent.