Theremin

Check what I found. The theremin is an musical instrument invented by the Russian inventor Léon Theremin in 1919, and it is unique in that it was the first musical instrument designed to be played without being touched. It generally consists of two pitch and one volume radio frequency oscillators and two metal antennas. With one hand you control the volume, with the other the pitch! Apparently it's very easy to learn but extremely difficult to master. This is one example, by master Masami Takeuchi:

I love the world because it's full of such amazing little surprises, every day. Today's surprise: the theremin.