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Theremin - Wikipedia
THEREMIN - Over The Rainbow - YouTube
The theremin - A short introduction to a unique instrument
The Soviet Spy Who Invented the First Major Electronic Instrument
Theremin World - What's a Theremin?
The theremin: The strangest instrument ever invented? - BBC
Theremin | electronic, sound synthesis, avant-garde | Britannica
Sounds of the Ether: a Brief History of the Theremin
How a Theremin Works | HowStuffWorks
No Touching, Only Playing: The Theremin - Google Arts & Culture