Having missed the show on Art Nation about the Tapestry Workshop I couldn't resist looking at it here.
The sound tapestry was amazing, it was a theremin instrument. I would like to know more about that. Here is a link to it in action, being used by Chicks on Speed.
I had heard of the theremin before, in relation to Dr Who and the new version of the theme. There are links to more info about the theremin if you follow this link.