Semicolon, Colon, & Dash Practice Test

PASSAGE II: The Ghost in the Machine

¹ In 1920, a Russian physicist named Leon Theremin was conducting experiments with high-frequency oscillators when he noticed something strange. As he moved his hand near the (11) equipments circuits, the pitch of the audio signal changed. Theremin realized he had stumbled upon a completely new way to produce sound. He quickly adapted his laboratory apparatus into a musical instrument. It was officially named the aetherphone, but it soon became known simply as the theremin.

² (12) Unlike a piano, a guitar, or a flute, the theremin is played without physical contact. The instrument consists of a wooden box featuring two metal antennas: a vertical one on the right and a horizontal loop on the left. (13) The vertical antenna controls pitch, while the horizontal loop controls volume. As the player’s hands move closer to or further from the antennas, they alter the electromagnetic fields surrounding them. This interference is translated into electrical signals, which are then amplified through a speaker.

³ Playing the theremin requires intense concentration and absolute physical control. Because there are no keys, frets, or strings to guide the musician, relying entirely on "muscle memory" and a flawless ear for relative pitch (14) is required. A tremor in the performer’s hand, a shift in posture, or even a deep breath can unintentionally alter the pitch. (15) Many people try to play the theremin and give up after a few days.

⁴ When Leon Theremin demonstrated his invention to the public in the 1920s, audiences were mesmerized. The musician stood behind the box, waving their hands in the air like an orchestra conductor, (16) coaxing out ethereal, trembling melodies. (17) The sound was often compared, by critics, to a human voice singing a wordless, mournful tune. Classical composers began writing concertos specifically for the instrument.

⁵ Despite its initial popularity, the theremin was ultimately too difficult for the average person to master, so it never became a household instrument. (18) However, it found a second life in Hollywood. In the 1950s, film composers realized that the theremin’s eerie, otherworldly wail was the perfect soundtrack for science fiction and psychological thriller movies. Whenever a flying saucer landed on screen or a character experienced a cinematic mental breakdown, the theremin was there to provide the sonic backdrop.

⁶ Today, the theremin is enjoying a modern resurgence. Contemporary artists use it to add a vintage, atmospheric layer to rock and electronic music. Though synthesizer technology has made it incredibly easy to produce identical sounds digitally, the physical magic of the theremin, (19) the act of pulling music out of thin air—remains utterly unique.