No. 10 - Theremin The theremin probably won't make anyone's list of most important inventions, but this instrument holds a place in many hearts, especially those of scary movie fans. Invented by a young Russian physicist named Leon Theremin in 1919, this musical instrument is played without anyone even touching it. The eerie sound produced by a theremin comes from the player moving his hands near the two antennas that respond to radio frequencies. One antenna is responsible for the volume, and the other is responsible for the pitch. If you still doubt its importance, try to get through this Halloween without it. Many classic horror movie soundtracks feature this creepy instrument. MORE TOP TENS
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