Keyboard instrument is the general name of instruments with keys arranged like piano keyboard. Each key on these instruments has a fixed pitch, so they can be used to play any music within their range. There are often resonance tubes or other devices for resonance under the keys.

When using a keyboard instrument, instead of directly hitting the strings of the instrument to produce vibration, the keys are used to produce sound through the mechanical mechanism or electronic components in the instrument. Compared with other musical instrument families, it has incomparable advantages, which is its wide range and the ability to produce multiple musical notes at the same time. Because of this, keyboard instruments, even as solo instruments, also have rich harmony effects and orchestral colors. Therefore, since ancient times, keyboard instruments have attracted the attention and love of composers and music lovers.