Musical instrument

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A musical instrument is a device constructed or modified with the purpose of making music. In principle, anything that produces sound, and can somehow be controlled by a person playing it, can serve as a musical instrument. The expression, however, is reserved generally for items that have a specific musical purpose. The academic study of musical instruments is called organology.

[edit] Types of musical instruments

Instruments are often divided by the way in which they generate the initial source of sound:

[edit] Instruments that generate sound from matter in its solid-state

• Voice, that is, the human voice, is an instrument in its own right. A singer generates sounds when airflow from the lungs sets the vocal cords into oscillation. The fundamental frequency is controlled by the tension of the vocal cords and the tone quality by the formation of the vocal tract; a wide range of sounds can be created.

• String instruments generate a sound when the string is plucked, strummed, slapped, etc. The frequency of the wave generated (and therefore the note produced) usually depends on the length of the vibrating portion of the string, its linear density (mass per unit length of string), the tension of each string and the point at which the string is excited; the tone quality varies with the construction of the resonating cavity. Examples: guitars, violins and sitars. Electric string instruments generate sound by a pickup placed under strings. The electric guitar and the electric bass are the most famous examples, but there is a wide variety of new instruments, because the electro-magnetic amplification generates new possibilities. Other Examples: 3rd bridge overtone koto, electric baritone, electric cymbalom.

• Percussion instruments create sound when struck. The shape and material of the part of the instrument to be struck and the shape of the resonating cavity, if any, determine the sound of the instrument. Examples: drums, bells and cymbals.

• Friction instruments are any instrument that use friction to create sound. For example the Glass harmonica.

• Lamellophones create a sound by the plucking of lamellas made from different materials (metal, raphia etc.). These Instruments are tunable, so they do not belong to the idiophones. An example is the Mbira.

[edit] Instruments that generate sound from matter in its gaseous state

• Wind instruments generate a sound when a column of air is made to vibrate inside them. The frequency of the wave generated is related to the length of the column of air and the shape of the instrument, while the tone quality of the sound generated is affected by the construction of the instrument and method of tone production. The group is typically subdivided into :
  • Woodwind instruments, such as the clarinet, oboe and flute,
  • Brass instruments, such as the trumpet, trombone and French horn.

[edit] Instruments that generate sound from matter in its liquid state

• Water instruments generate pressure waves by oscillation, turbulence, or similar disturbance in water. Water instruments are like woodwind instruments in some ways, except that the operative fluid (liquid) is for the most part incompressible fluid, as compared with wind (air) which is highly compressible). Water instruments are called hydraulophones and work best underwater, but are often designed so that they can be heard in a surrounding air medium even though they are typically water-filled or operate in-part underwater.

[edit] Instruments that generate sound from matter in its plasma state

• Plasma instruments generate pressure waves by oscillation of matter in a high-energy state such as plasma. Examples include the ionophone, the predecessor of the modern loudspeaker, and the plasmaphone, an acoustic instrument that generates sound in response to direct manipulation of plasma by a musician's fingers.

[edit] Quintephones (instruments that generate sound informatically)

Instruments generate sound either acoustically (from matter in its solid, liquid, gaseous, or higher-energy state), or informatically, from matter in its state of Quintessence (Quintessence, also known as Idea, was the fifth-classical element of Plato and Aristotle). [1]

Instruments that generate sound from quintessence (Idea) use some form of computation, algorithm, or calculative process, whether by analog circuits (as in the Theremin), by digital circuits (as in modern software synthesizers), by mechanical computing (as in the use of the phonograph disk as a sampling instrument), or by optical means (as in instruments like the optagan.

• Electronic instruments generate sound through electronic means. They often mimic other instruments in their design, particularly keyboards, drums and guitars. Examples: synthesizers and theremins.

• Mechanical computation, synthesis, or sampling instruments

Instruments like the turntable generate sound mechanically, although they record specific samples. Other similar instruments have been built that use mechanical computing rather than electronic computing in order to achieve sound synthesis, storage and recall of sound samples, and mechanical manipulation of sound samples.

• Sound synthesis using optical computation, optical sampling, optical storage, and the like. Instruments like the optagan use optical storage media. Other similar musical instruments have been made from motion picture film projectors that have an optical sound track.

[edit] User-interfaces for musical instruments

Regardless of how the sound in an instrument is produced, many musical instruments have a keyboard as the user-interface.

• Keyboard instruments are any instruments that are played with a musical keyboard. Every key generates one or more sounds; most keyboard instruments have extra means (pedals for a piano, stops for an organ) to manipulate these sounds. They may produce sound by wind being fanned (organ) or pumped (accordion), vibrating strings either hammered (piano) or plucked (harpsichord), by electronic means (synthesizer) or in some other way. Sometimes, instruments that do not usually have a keyboard, such as the Glockenspiel, are fitted with one. Though they have no moving parts and are struck by mallets held in the player's hands, they possess the same physical arrangement of keys and produce soundwaves in a similar manner.

[edit] Musical instrument classification

Many alternate divisions and further subdivisions of instruments exist. To learn about specific instruments, consult the list of musical instruments or list of archaic musical instruments.

[edit] History

The solid and gas classes of instruments are mentioned in ancient sources, such as Egyptian inscriptions, the Bible and the many thousand year old Hindu Vedas, and probably predate recorded history. The human body, generating both vocal and percussive sounds, may have been the first instrument. Percussion instruments such as stones and hollow logs are another likely candidate. For instance, nine-thousand-year-old bone flutes or recorders have been found in Chinese archeological sites.

Instruments that make sound from matter in its liquid or plasma state, as well as instruments that make sound informatically, e.g. optical, mechanical, or electrical (analog or digital) computing are somewhat newer.

[edit] Related articles

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