One of the most unique and unusual instruments in the history of music, the theremin is played using proximity sensors distributed in two perpendicular antennae. The distance between the performer’s hands from the first antenna determines pitch, and the second determines volume. Although it is not the first electrical instrument ever created, it underscores the beginning of the musical shift from acoustic to electronic, and perhaps even society’s growing development in and dependence on technology.

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“Theremin.” Wikipedia, Wikimedia Foundation, 1 Mar. 2018, en.wikipedia.org/wiki/Theremin.

Image Source: What’s On the Air Company, via Wikimedia Commons.