A theremin.
What is a theremin? It's, as far as I found, the oldest electronic musical instrument. Invented around 1920 by the Russian Leon Theremin as he was trying to find a way to audible detect the changes in gas density (which was his actual work around that time). A theremin is the only instrument that's played without touching it. It's sound is generated through 2 electro-magnetic antennae on either side: 1 controlling the pitch and one…
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