The theremin (/ˈθɛrəmɪn/ THERR-ə-min; originally known as the ætherphone/etherphone, thereminophone or termenvox/thereminvox) 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 (Термéн), who patented the device in 1928.