the sound of the inside of an oven.
http://www.sound-effect.com/track/oven-fan-interior-oven-on-r-27795/oven/
This and many other domestic appliance sounds on this site. I wonder whether, when played alongside our performance piece, we could induce the feeling of escalation, even though the sounds are very much repetitive, atonal drones.
check out My Fridge Is Possessed:
http://www.youtube.com/watch?v=xF8OzDrGXbo&feature=related
There’s a whole line in fridge noises on youtube…particularly scary ones.