 The solo instrument that produces the melody in the title music is a  theremin. It was invented by Russian scientist Leon Theremin (qv)  and was first demonstrated in 1920. It predates the modern  synthesizer by about 40 years, but its uniqueness stems from the  fact that it is the only instrument that is played without actually  being touched. Its electronic circuits are controlled by two  antennas, left and right of the instrument, toward which the player  moves his or her hands. The closer the right hand to one antenna,  the higher the pitch. Similarly the proximity of the left hand to  the other antenna controls the volume. The theremin has a range well  in excess of eight octaves, and is capable of all kinds of strange  effects. These sounds have been put to use in science fiction and  other films including Alfred Hitchcock (I) (qv)s  _Spellbound (1945)_ (qv) and Robert Wise (I) (qv)s  _Day the Earth Stood Still, The (1951)_ (qv). This unique instrument  has also been used on The Beach Boys (qv) song "Good Vibrations."  The late Clara Rockmore (qv) was the theremins greatest virtuoso,  and the instrument and its inventor were profiled in the documentary  _Theremin: An Electronic Odyssey (1994)_ (qv).