To play the theremin, the performer stands in front of the instrument, a little left of center. The feet are spread slightly to keep the body as motionless as possible. To determine the pitch of the instrument's tone, the player varies the distance between her right hand and the pitch antenna. To determine the loudness of the instrument's tone, the player varies the distance between her left hand and the middle of the volume antenna. Maximum loudness occurs when the hand is removed from the antenna; complete silence occurs when the hand is an inch or so from the loop.

[If Rockmore] were to play an upward arpeggio, she would start on the lowest note with right hand tilted back and fingers withdrawn. To play the next note she would abruptly move her hand forward from the wrist, while keeping her right arm motionless. The third note would be played by rapidly extending the little finger, and the fourth note by extending one or two more fingers while simultaneously turning the wrist sideways to bring the newly-extended fingers nearer to the pitch antenna. She would then continue the arpeggio by moving her whole arm closer to the pitch antenna while drawing her hand and fingers back, then repeating the above-described succession of movements. At the same time, she may articulate each individual pitch by rapidly shooting the fingers of her left hand into the volume antenna loop, then withdrawing them, to silence the tone during the very short periods of time that her right hand moves from one pitch to another. No other theremin player has ever mastered this difficult and intricate technique for playing rapid successions of precise pitches - "aerial fingering" as one reviewer termed it.

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