Devise an interactive electronic toy, tool or game where the user/player controls, creates or reacts to sound or music.

In this project I was very much interested how sound manipulate, enhance, foster, attract.... the interaction between two people.

Could an instrument that was only able to make sound when used by two people simultaneously create intimacy, communication, anticipation, interaction, relationship, play, experience, friendship, disagreement, incompatibility, understanding, interaction, responding, hearing, attention, affection, prediction, bonding, expression, fun, randomness... or would it be two instruments that would only play if both were sued at the same time and they would listen to each other.

In order to get a little closer to what I am looking for I started with a few user experiments.