"We have two different ways of working. One is completely unstructured where somebody just starts playing and somebody joins in and then the other person joins in, and something starts to happen. That's occasionally what happens. What more often happens is that we settle on some sort of - a few sort of structural ideas, like, "Okay, when I put my finger up, we're all going to move to the extremes of our instruments. So, that means you can only play either very high or very low or both. And we're going to stay there until I take my finger down."