The theremin is an early electronic musical instrument controlled without physical contact by the thereminist (performer). It is named after the Westernized name of its Russian inventor, Léon Theremin, who patented the device in 1928. The instrument’s controlling section usually consists of two metal antennas that sense the relative position of the thereminist’s hands and control oscillators for frequency with one hand, and amplitude (volume) with the other. The electric signals from the theremin are amplified and sent to a loudspeaker. (More from Wikipedia)
John Bush in Allmusic says of the background behind this classic: “‘Good Vibrations’, the Beach Boys’ 1966 entry into the best-single-of-all-time sweepstakes, announced the coming era of pop experimentation with a rush of riff changes, echo-chamber effects, and intricate harmonies, plus the very first theremin ever heard on a pop record. The natural grace of the song belied the months of recording and mountain of tape reels it required, however. Though Brian Wilson’s self-described ‘pocket symphony’ was his masterpiece, its creation effectively put the coda on his production career, and he was never the same again. . . . In the end, ‘Good Vibrations’ cost over 50,000 dollars to produce, making it one of the most expensive singles recorded up to that point.”
(June 2013/2)