Vocal improvisation from Augusto Boal
Each person go alone to a corner of the room and find a phrase that can be repeated.
At a signal from the leader, find another person, listen to their phrase, while singing your phrase, and slowly transform the 2 phrases into one phrase.
Go back to your alone space.
Transform the new phrase into a new solo phrase.
Find a new partner.
Unify/transform your phrases.
With your partner, find another duo and unify your 2 phrases.
As a foursome, find another foursome, unify and transform.
Come together as a whole group and slowly transform the entire music into one phrase that everyone can sing together.