The proliferation of electricity in the 20th century led to a new category of musical instruments: electronic instruments, or electrophones.[114] The vast majority produced in the first half of the 20th century were what Sachs called "electromechanical instruments"; they have mechanical ration that produce sound vibrations picked up and amplified https://www.indiemusicshop.be/magasin-equipement-sonore-waterloo-belgique-vente-en-ligne-bruxelles-instruments-de-musique