Historically the first musical instruments were drums made from the tree trunks and animal skins, and animal horns. Gradually the prehistoric human invented strings and pipes. Then the ancient Greeks invented primitive monocord and cyther, that consisted of several strings and frets, and a resonant box. As centuries passed it evoluted to lute, harp, fiddle, viola and lots of other stringed instruments. Horns evoluted to trumpets and trombones, pipes evoluted to flutes. Then the progress led to invention of contemporary violins, cellos, doublebasses, pianos, clarinets, guitars. In the 20th century the first electronic instruments appeared thanks to technical progress - these are electric guitars, electric violins, electric cellos, bass-guitars, electric doublebasses, even electric flutes, which do not immidiately produce sound, but require sound processors and amplifiers to deliver is to the listeners. Unlike these contemporary music synthesizers do not produce sound at all, but