The theremin is one of the first electronic music devices which was created by Soviet inventor Leon Theremin. It creates sounds by waving your hands near two antennas. The sounds created were often used for television shows and movies often with an eerie theme. One famous movie to use it was The Day the Earth Stood Still. Many Star Trek fans claim it was used to create the original show’s theme song however it was vocals by Loulie Jean Norman where she created a theremin-like sound.