What are the types of keyboard instrument?
Keyboards are one of the most diverse musical instrument classifications. Divided into four main categories—chordophones, aerophones, idiophones, and electrophones, each of which overlaps with other instrument families. Chordophones are those that produce sound through the vibration of strings.

What are the major keyboard instruments?
The most common of these are the piano, organ, and various electronic keyboards, including synthesizers and digital pianos.