Even if you don’t know what a theremin is, you’ve almost certainly heard it. The futuristic instrument — played by carefully gesturing with your hands in the air — has been a staple of old sci-fi movies and used to add an air of mystery in popular music.  This year the instrument is celebrating its 100th anniversary, so synthesizer giant Moog is honoring it by making, well, a very fancy theremin. It’s called the Claravox Centennial, after Clara Rockmore, one of history’s best theremin players  — and one who helped showed the instrument could be used for more than creepy music.…

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