Experimental musical instrument including intonarumori ("intoners" or "noise machines"), to create "noises" for performance. Unfortunately, none of his original intonarumori survived World War II. Replicas are being made though. Léon Theremin was a Russian inventor, most famous for his invention of the theremin around 1919–1920, one of the first electronic musical instruments. The Ondes Martenot is another early example of an electronic musical instrument. The luthéal is a type of prepared piano created by George Cloetens in the late 1890s and used by Maurice Ravel in his "Tzigane" for luthéal and violin. The instrument can produce sounds like a guitar or a harmonica,
Musical instrument the twentieth century saw the gradual evolution of synthesizers—instruments that artificially produce sound using analog or digital circuits and microchips. In the late 1960s, Bob Moog and other inventors began an era of development of commercial synthesizers. One of the first of these instruments was the Moog synthesizer. The modern proliferation of computers and microchips has spawned an entire industry around electronic musical instruments. There are many different methods of classifying musical instruments. Various methods examine aspects such as the physical properties of the instrument (material, color, shape, etc.), the use for the instrument, the means by which music is