A musical instrument that produces sound by striking strings with hammers when keys are pressed.
The highness or lowness of a sound, such as the different notes produced on a piano.
The number of complete cycles of a sound wave that occur in one second. In relation to a piano, this is what determines the pitch of each note played.
The brain's ability to interpret and make sense of sounds received from the ears. It plays an important role in appreciating the different musical notes produced by a piano.