Here Is The Way You Play a Theremin:

You turn it on. Then you wait.

You wait for several reasons. You wait to give the tubes the chance to warm, like creatures taking their first breaths. You wait in order to heighten the audience's suspense. And, finally, you wait to magnify your own anticipation. It is a thrill and a terror. You stand before a cabinet and two antennas and immediately the space itself is activated, the room is charged, the atmosphere is alive. What was potential is potent. You imagine sparks, embers, tiny lightning flecks balanced in the vacant air.

You raise your hands.

Raise the right hand first, toward the pitch antenna, and you will hear it: DZEEEEOOOoo, a shocked electric coo, steadying into a long hymn. Raise the left hand, toward the volume antenna, and you will quiet it.

Move your hands again, and the device will sing.

My theremin is a musical instrument, an instrument of the air. Its two antennas emerge from a closed wooden box. The pitch antenna is tall and black, noble. The closer your right hand gets, the higher the theremin's tone. The second antenna controls volume. It is bent, looped, gold, and horizontal. The closer you bring your left hand, the softer the instrument's song. The farther away, the louder it becomes. But always you are standing with your hands in the air, like a conductor. That is the secret of the theremin, after all: your body is a conductor.

-Sean Michaels, Us Conductors, pp. 26-7.