Electrotheremin - Bob Whitsell, 1958.
Played by Paul Tanner.
This is the electrotheremin. This is not a theremin, it only produces a sound similar to the theremin. It is played by tweaking knobs and sliding along a keyboard diagram. Contrary to popular belief, the Beach Boys song ‘Good Vibrations’ features an electrotheremin, not a theremin. For live performances, the Beach Boys used a custom made Moog ribbon controller.
Check: Beach Boys, ‘Good Vibrations’, ‘I Just Wasn’t Made for These Times’