1. Sachs later added a fifth category, electrophones, such as theremins, which produce sound by electronic means.

2. A man whose late father was a subscriber sent me the Electrophone programme for the month of May 19

3. Find Complete List of Musical Instruments used Worldwide - List of Percussion Instruments (Idiophones, Membranophones) - List of Wind Instruments (Aerophones) - List of Stringed Instruments (Chordophones) - Electronic Instruments (Electrophones) - Keyboard Instruments - Listing