The Hornbostel–Sachs system of musical instrument classification groups all instruments which make sound primarily by way of electrically driven oscillators. Though Sachs divided the category of electrophones into three distinct subcategories, specifying these three as: 51 - Electrically actuated acoustic instruments 52 - Electrically amplified acoustic instruments 53 - Instruments which primarily produce sound with electrically driven oscillators In the present day only instruments belonging to this last subcategory are considered "electronic musical instruments".
List
ANS synthesizer Chamberlin Mellotron Clavioline Croix Sonore Electronde Electronic drum Electronic keyboard Hammond organ Moog modular synthesizer Novachord Ondes Martenot Therevox Ondioline Oramics Radiodrum Spharophon Stylophone Synthesizer Analog synthesizer Digital synthesizer Telharmonium Theremin Electro-Theremin Trautonium
See also List of classic synthesizers List of Hammond organs