From that Wiki link: "One of the most persistent theremin myths is that
The Beach Boys used one in the 1966 recording of "
Good Vibrations".
Brian Wilson did request that a theremin be included in the studio orchestra for this recording, but neither the instrument nor a musician to play it were available at the time. Instead,
Paul Tanner was brought in with his homemade device called an
Electro-Theremin, which featured mechanical controls that could mimic the theremin sound. For concert appearances, a slide-controlled oscillator was designed and built for Wilson by
Robert Moog."