Keyboard instruments are instruments that are sounded by means of a keyboard. The organ and piano are two of the principal members of the keyboard family. The organ consists of pipes which are operated by one or more manuals (keyboards) and a pedal board. the pipes are are lined up in rows (known as ranks or registers ) on top of a wind chest. The sound of the organ is made when air is admitted into a pipe by pressing a key or pedal. The piano consists of wire strings stretched over a metal frame, and a keyboard and pedals that operate hammers and dampers. The piano frame is either vertical-as in the upright piano. When a key is at rest, a damper lies against the string to stop it vibrating. When a key is pressed down, the damper moves away from the string as the hammer strikes it, causing the string to vibrate and sound a note.
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