The Theremin is the oldest electronic instrument you play without touching. It was invented in 1919 by a Soviet radio engineer Leon Theremin. The Theremin works by moving your hands through two electromagnetic fields that are around two antennas. The horizontal loop antenna on the left controls the volume and the vertical antenna on the right controls the pitch. With your right hand you can change the pitch by moving it back and forth between your body and the antenna. The closer you get to the antenna, the higher the pitch. And with the other hand you control the volume. The further away you move your hand from the antenna the volume goes down.