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 slide invented in
1928 by
Maurice Martenot[?], and originally very similar in sound to the
Theremin. The sonic capabilities of the instrument were subsequently expanded by the addition of
filter banks and switchable
loudspeakers.
The instrument has been used by many composers, most notably Olivier Messiaen. He used it in many of his works, such as the Turangalīla Symphony[?] and the Trois Petites Liturgies de la Presence Divine.