Chordophones produce sound from vibrating strings:
Additionally, members of the harpsichord and piano families may also use alternative setups to make the instruments more compact:
Aerophones produce sound primarily by causing a body of air to vibrate, without the use of strings or membranes:
Idiophones produce sound primarily by the vibration of the instrument itself, without the use of air flow, strings, membranes or electricity:
Electrophones produce sound by electrical means:
Kelzenberg, David. "What are Historical Keyboard Instruments?". Archived from the original on 2013-02-12. Retrieved 2012-10-25. https://web.archive.org/web/20130212121344/http://www.mhks.org/whatare.htm ↩