The piano is one of the most famous keyboard instruments. The sound of the piano is produced by the impact of hammers on its metal strings inside a wooden box. These hammers move when the keys are pressed. The piano strings are attached to a plate called the "sound plate", which acts as their amplifier.
In general, the piano consists of 8 octaves. The piano has the highest amplitude of any instrument (except the church organ), so that in its current form it typically has eight octaves and is capable of producing frequencies from about 27 to 4186 Hz, while in comparison with the violin instrument only They can produce about five octaves and the best singers can only read about three octaves.