Keyboard instruments come in many sizes and shapes but all use a keyboard as a control interface: a row of levers pressed by the fingers. The piano is the most common keyboard instrument.
Keyboard | Control interface for piano, organ and related instruments
Sounds from the keyboard family vary greatly: pipes, reeds, plucked strings, hammered strings, bells and electronics. When classified according to sound production, pianos are chordophones due to use of vibrating strings, whereas pipe organs are aerophones because of the vibrating air columns within pipes.
Most of the keyboard family is capable of producing both melody and harmony simultaneously, making them a favorite tool of arrangers and composers.
Double Virginal | Hans Ruckers (c.1581) | Small harpsichords, called virginals, were popular in homes during the Baroque. | Metropolitan Museum of Art
Harpsichord
The harpsichord precedes the piano by centuries but shares a similar form factor. A plectrum mechanism (quill) plucks harpsichord strings, whereas pianos strike the strings with a hammer. Harpsichord tone is softer, shorter in sustain and more metallic than the piano. Harpsichords are incapable of graded dynamics (e.g., crescendo and diminuendo) since the keys do not respond to pressure.
Introducing the Harpsichord | Mr. Devine discusses the harpsichord (2:55)
Piano
The piano was invented during the early eighteenth century by Italian luthier Bartolomeo Cristofori (1655-1731). Although similar in appearance to a harpsichord, the piano uses felt hammers to strike the strings instead of plucking with a quill. Hammers produce a darker tone and longer sustain than quills.
The original name was piano e forte (soft and loud), because, unlike the harpsichord, it was able to produce dynamics from piano to forte. Dynamics are controlled by striking the key harder or softer. Eventually the name was shortened to pianoforte but is called the piano (soft) in North America albeit modern designs are louder than ever!
Étude in C Minor, Op. 10 No.12 (Revolutionary) | Fréderic Chopin (2:34)
Organ
The oldest keyboard instrument, the organ, uses air flowing through pipes to create sound, qualifying it an aerophone. The first pipe organ was the water powered hydraulis, invented in Greece during the third century BC. Nero (37-68 CE), a Roman emperor and persecutor of Christians, introduced the organ to Rome in 67 CE. Organs were loud enough to be played in coliseums and quickly became a status symbol of the Roman upper class. The instrument eventually spread throughout Europe and the Middle East. By the fifteenth century, organs were a common installation in Christian churches.
Most pipe organs have multiple keyboards for the hands and a pedal keyboard for the feet. Multiple keyboards allow playing of multiple banks of pipes. Each bank of pipes has a different timbre such as flute, reed, brass, etc. Banks of pipes may be switched by opening and closing knobs called stops. Organists mix pipe timbres for expression and dynamic control.
Organ (1692) | A German household organ (regal) built by Simon Bauer. To produce sound, somebody pumped the bellows. | Museum of Fine Arts
Organ pipes need air to sound and, prior to electric pumps, air flow was created for large church organs with bellows pumped by little boys inside the organs!
Electronic musical instruments—electrophones—produce sound with electronics: an electrical signal is output, processed and amplified through an audio system.
Most electronic instruments are modified acoustic instruments, e.g., electric guitar, electric violin, electric 'ukulele, etc. A mechanical vibration such as a plucked or bowed string is processed and amplified via electronics.
Dimmar Öldur Rísa | Gulli Bjornsson | Performed by JIJI | The electric guitar is one of the most common electrophones. (9:12)
Some electrophones are purely electronic, as is the case of computers, samplers and synthesizers. That is, there are no mechanical vibrations to mic and process. Musical sounds are generated solely within the circuits of the electrophone.
Purely electronic musical instruments were not common until the second half of the twentieth century and had little use in classical and traditional music. However, they are important in popular music, film scoring and computer games.
Sniff | DOMi and JD Beck | Nord Lead A1 and Stage 3 synthesizers and analog percussion. (4:17)
Harpsichord
Piano
Organ
Electrophones
Modified Acoustic Instruments
Purely Electronic
