Astor Piazzolla (1921-1922) From “Histoire du Tango” -night club 1960- (live, Bonn, Germany dec, 07) Mirelys Morgan, violin, Pablo Garibay, guitar. Concert for Prof. Dr. Theodor Berchem, DAAD. Examples of electromechanical instruments are the telharmonium, Hammond organ , and the electric guitar, whereas examples of electronic instruments are a Theremin, synthesizer, and a computer.