String instrument in the context of Vincenzo Rugeri

The lyre (/ˈlaɪər/) (from Greek λύρα and Latin lyra) is a stringed musical instrument that is classified by Hornbostel–Sachs as a member of the lute family of instruments. In organology, a lyre is considered a yoke lute, since it is a lute in which the strings are attached to a yoke that lies in the same plane as the sound table, and consists of two arms and a crossbar.

The lyre has its origins in ancient history. Lyres were used in several ancient cultures surrounding the Mediterranean Sea. The earliest known examples of the lyre have been recovered at archeological sites that date to c. 2700 BCE in Mesopotamia. The oldest lyres from the Fertile Crescent are known as the eastern lyres and are distinguished from other ancient lyres by their flat base. They have been found at archaeological sites in Egypt, Syria, Anatolia, and the Levant. In a discussion of the Nubian lyre, Carl Engel notes that modern Egyptians call it qytarah barbarîyeh, reflecting its association with the Barbaras (Berbers)—linked to the brbrta of ancient Egyptian references to Punt, a region identified with present-day Somalia, where the shareero lyre remains in use.

Yoke lutes, commonly called lyres, are a class of string instruments, subfamily of lutes, indicated with the codes 321.21 and 321.22 in the Hornbostel–Sachs classification.

A lute (/ljuːt/ or /luːt/) is any plucked string instrument with a neck and a deep round back enclosing a hollow cavity, usually with a sound hole or opening in the body. It may be either fretted or unfretted.

More specifically, the term "lute" commonly refers to an instrument from the family of European lutes, which were themselves influenced by short-necked lutes in Gandhara (modern-day Pakistan) which became the predecessor of the Islamic, the Sino-Japanese and the European lute families. The term also refers generally to any necked string instrument having the strings running in a plane parallel to the sound table (in the Hornbostel–Sachs system).

A soundboard (or sounding board) is the surface of a string instrument that the strings vibrate against, usually via some sort of bridge. Depending on the instrument, it is also called a top, top plate, resonator, table, sound-table, or belly. It is usually made of a softwood, often spruce.

Pianos, guitars, banjos, and many other stringed instruments incorporate soundboards. The resonant properties of the soundboard and the interior of the instrument greatly increase the loudness of the vibrating strings. "The sound board is probably the most important element of a guitar in terms of its influence on the quality of the instrument's tone [timbre]."

Prehistoric music (previously called primitive music) is a term in the history of music for all music produced in preliterate cultures (prehistory), beginning somewhere in very late geological history. Prehistoric music is followed by ancient music in different parts of the world, but still exists in isolated areas. However, it is more common to refer to the "prehistoric" music which still survives as folk, indigenous or traditional music. Prehistoric music is studied alongside other periods within music archaeology.

Findings from Paleolithic archaeology sites suggest that prehistoric people used carving and piercing tools to create instruments. Archeologists have found Paleolithic flutes carved from bones in which lateral holes have been pierced. The disputed Divje Babe flute, a perforated cave bear femur, is at least 40,000 years old. Instruments such as the seven-holed flute and various types of stringed instruments, such as the Ravanahatha, have been recovered from the Indus Valley civilization archaeological sites.

Oscillation is the repetitive or periodic variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples of oscillation include a swinging pendulum and alternating current. Oscillations can be used in physics to approximate complex interactions, such as those between atoms.

Oscillations occur not only in mechanical systems but also in dynamic systems in virtually every area of science: for example the beating of the human heart (for circulation), business cycles in economics, predator–prey population cycles in ecology, geothermal geysers in geology, vibration of strings in guitar and other string instruments, periodic firing of nerve cells in the brain, and the periodic swelling of Cepheid variable stars in astronomy. The term vibration is precisely used to describe a mechanical oscillation.

A fiddle is a bowed string musical instrument, most often a violin or a bass. Fiddle is a colloquial term for the violin, used by players in all genres, including classical music. Although in many cases violin and fiddle are essentially synonymous, the style of the music played may determine specific construction differences between fiddles and classical violins. For example, fiddles may optionally be set up with a bridge with a flatter arch to reduce the range of bow-arm motion needed for techniques such as the double shuffle, a form of bariolage involving rapid alternation between pairs of adjacent strings. To produce a brighter tone than the deep tones of gut or synthetic core strings, fiddlers often use steel strings. The fiddle is part of many traditional (folk) styles, which are typically aural traditions—taught "by ear" rather than via written music.

Fiddling is the act of playing the fiddle, and fiddlers are musicians who play it. Among musical styles, fiddling tends to produce rhythms that focus on dancing, with associated quick note changes, whereas classical music tends to contain more vibrato and sustained notes. Fiddling is also open to improvisation and embellishment with ornamentation at the player's discretion, in contrast to orchestral performances, which adhere to the composer's notes to reproduce a work faithfully. It is less common for a classically trained violinist to play folk music, but today, many fiddlers (e.g., Alasdair Fraser, Brittany Haas, and Alison Krauss) have classical training.

The pochette is a small stringed instrument of the bowed variety. It is a small violin-like instrument designed to fit in a pocket, hence the name "pochette" (French for small pocket).

Also known as a pocket fiddle, it was designed to be used by dance masters in royal courts and noble households, and by street musicians, from about the 15th century until around the 19th century, becoming especially popular in the 1800s. Prior, the rebec was used in a similar way, and some modern pochettes descend from the rebec instead of the violin family.

In music, strings are long flexible structures on string instruments that produce sound through vibration. Strings are held under tension so that they can vibrate freely. The pitch (frequency) at which a string will vibrate is primarily related to its vibrating length (also called speaking length), its tension, and its mass per unit of length. A vibrating string produces very little sound by itself. Therefore, most string instruments have a soundboard to amplify the sound.

There are two main kinds of strings; plain and wound. "Plain" strings are simply one piece of long cylindrical material, commonly consisted of nylon or gut. "Wound" strings have a central core, with other material being tightly wound around the string .

In music, a bow (/boʊ/) is a tensioned stick which has hair (usually horse-tail hair) coated in rosin (to facilitate friction) affixed to it. It is moved across some part (generally some type of strings) of a musical instrument to cause vibration, which the instrument emits as sound. The vast majority of bows are used with string instruments, such as the violin, viola, cello, and bass, although some bows are used with musical saws and other bowed idiophones.

Pizzicato (/ˌpɪtsɪˈkɑːtoʊ/, Italian: [pittsiˈkaːto]; translated as 'pinched', and sometimes roughly as 'plucked') is a playing technique that involves plucking the strings of a string instrument. The exact technique varies somewhat depending on the type of instrument:

• On bowed string instruments it is a method of playing by plucking the strings with the fingers, rather than using the bow. This produces a very different sound from bowing, short and percussive rather than sustained.
• On keyboard string instruments, such as the piano, pizzicato may be employed (although rarely seen in traditional repertoire, this technique has been normalized in contemporary music, with ample examples by George Crumb, Tōru Takemitsu, Helmut Lachenmann, and others) as one of the variety of techniques involving direct manipulation of the strings known collectively as "string piano".
• On the guitar, it is a muted form of plucking, which bears an audible resemblance to pizzicato on a bowed string instrument with its relatively shorter sustain. It is also known (especially in non-classical guitar) as palm muting.

When a string is struck or plucked, including pizzicato, sound waves are generated that do not belong to a harmonic series as when a string is bowed. This complex timbre is called inharmonicity. The inharmonicity of a string depends on its physical characteristics, such as tension, composition, diameter and length. The inharmonicity disappears when strings are bowed because the bow's stick-slip action is periodic, so it drives all of the resonances of the string at exactly harmonic ratios, even if it has to drive them slightly off their natural frequency.

A vibration in a string is a wave. Initial disturbance (such as plucking or striking) causes a vibrating string to produce a sound with constant frequency, i.e., constant pitch. The nature of this frequency selection process occurs for a stretched string with a finite length, which means that only particular frequencies can survive on this string. If the length, tension, and linear density (e.g., the thickness or material choices) of the string are correctly specified, the sound produced is a musical tone. Vibrating strings are the basis of string instruments such as guitars, cellos, and pianos. For a homogeneous string, the motion is given by the wave equation.

A plectrum is a small flat tool used for plucking or strumming of a stringed instrument. For hand-held instruments such as guitars and mandolins, the plectrum is often called a pick and is held as a separate tool in the player's hand. In harpsichords, the plectra are attached to the jack mechanism.

The oud (/uːd/ OOD; Arabic: عُود, romanized: ʿūd, pronounced [ʕuːd]) is a Middle Eastern short-neck lute-type, pear-shaped, fretless stringed instrument (a chordophone in the Hornbostel–Sachs classification of instruments), usually with 11 strings grouped in six courses, but some models have five or seven courses, with 10 or 13 strings respectively.

The oud is similar to other types of lute, and to Western lutes which developed out of the Medieval Islamic oud. Similar instruments have been used in the Middle East, some predating Islam, such as the barbat from Persia. Different versions of the oud are used in Arabia, Turkey, and other Middle Eastern and Balkan regions. The oud, as a fundamental difference with the western lute, has no frets and a smaller neck. It is the direct successor of the Persian barbat lute. The oldest surviving oud is thought to be in Brussels, at the Museum of Musical Instruments.

The citole was a string musical instrument, closely associated with the medieval fiddles (viol, vielle, gigue) and commonly used from 1200–1350. It was known by other names in various languages: cedra, cetera, cetola, cetula, cistola, citola, citula, citera, chytara, cistole, cithar, cuitole, cythera, cythol, cytiole, cytolys, gytolle, sitole, sytholle, sytole, and zitol.

Like the modern guitar, it was manipulated at the neck to get different notes, and picked or strummed with a plectrum (the citole's pick was long, thick, straight and likely made of ivory or wood). Although it was largely out of use by the late 14th century, the Italians "re-introduced it in modified form" in the 16th century as the cetra (cittern in English), and it may have influenced the development of the guitar as well. It was also a pioneering instrument in England, introducing the populace to necked, plucked instruments, giving people the concepts needed to quickly switch to the newly arriving lutes and gitterns. Two possible descendant instruments are the Portuguese guitar and the Corsican Cetera, both types of cittern.

The archlute (Spanish: archilaúd, Italian: arciliuto, German: Erzlaute) is a European plucked string instrument developed around 1600 as a compromise between the very large theorbo, the size and re-entrant tuning of which made for difficulties in the performance of solo music, and the Renaissance tenor lute, which lacked the bass range of the theorbo. Essentially a tenor lute with the theorbo's neck-extension, the archlute lacks the power in the tenor and the bass that the theorbo's large body and typically greater string length provide.