The Ondes Martenot is an early electronic musical instrument with a keyboard and slide invented in 1928 by Maurice Martenot, and originally very similar in sound to the Theremin. The Ondes Martenot (or Ondes-Martenot or Ondes martenot or Ondium Martenot or Martenot or ondes musicale) is an early electronic musical instrument with a keyboard and […]