The Song of the Matryoshkas

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What happens when you put 167 single-oscillator theremins inside 167 matryoshka dolls and give them to 167 musicians? Beethoven's Symphony No. 9, that's what (story, videos): http://mentalfloss.com/article/51929/167-theremin-players-perform-beethoven
   And if you're now intrigued enough to want to learn more about this instrument when it's not inside a nesting doll, well, here's an old post about it: http://somanyinterestingthings.blogspot.com/2013/07/their-theremin-show.html