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The neck of a guitar showing the nut (in the background, coloured white) and first four metal frets.

A fret is a raised portion on the neck of a stringed instrument, that extends generally across the full width of the neck. On most modern western instruments, frets are metal strips inserted into the fingerboard. On historical instruments and some non-European instruments, pieces of string tied around the neck serve as frets.

Frets divide the neck into fixed segments at intervals related to a musical framework. On instruments such as guitars, each fret represents one semitone in the standard western system where one octave is divided into twelve semitones.

"To fret" is often used as a verb, meaning simply "to press down the string behind a fret."

Contents

Explanation

The fret is one of the most important parts of a guitar. Pressing the string against the fret reduces the vibrating length of the string to that between the bridge and the next fret between the fretting finger and the bridge. This is damped if the string were stopped with the soft fingertip on a fretless fingerboard.

An advantage of frets is that they make it much easier to achieve an acceptable standard of intonation since the positions for the correct notes are given by the frets. Furthermore, playing chords are much easier on a fretted fingerboard.

A disadvantage of using frets is that the player is restricted by the temperament given by the position of the frets. Some influence on the intonation is still possible, however. The string can be pulled to the side to increase the string tension and the pitch. This technique (commonly called 'bending') is often used by electric guitarists of all genres and is a very important part of sitar playing. On instruments with thicker frets, the string tension and pitch will vary with the pressure of the finger behind the fret. Sometimes it is also possible to pull the string toward the bridge or nut, thus lowering or raising the string tension and pitch, respectively. However, with the exception of instruments like the sitar, where extensive pulling of the string is possible, much less influence on the intonation is possible than on unfretted instruments.

Since the intonation of most modern western fretted instruments is equal tempered, the ratio of the distances of two consecutive frets to the bridge is \sqrt[12]{2}, or approximately 1.059463. Theoretically, the twelfth fret should divide the string in two exact halves. To compensate for the increase in string tension when the string is pressed against the frets, the bridge position can be adjusted slightly so that the 12th fret plays exactly in tune.

Frets tied on to the neck of a saz; note microtonal frets between semitones.

Many instruments' frets are not spaced according to the semitones of equal temperament, including the Appalachian dulcimer (with frets in a diatonic scale), the Turkish Saz (with frets spaced according to the Makam system of Turkish folk music), the Arabic Buzuq (with frets spaced according to the Arabic Maqam system), and the Persian setar and tar (with frets spaced according to the Persian Dastgah system), and the Turkish tanbur (with as many as 5 frets per semitone, to cover all of the commas of the Turkish Makam system).

Variations

Slanted frets: Most frets are perpendicular to the instrument's neck. Though slanted frets might be more ergonomic, few luthiers offer slanted or fanned frets; Rickenbacker offered them in the late 60's, and Novax Guitars offers such guitars today. The appearance of angled frets on these modern instruments belies the antiquity of this technique. Fanned frets first appeared on the 16th century Orpharion, a variant of the cittern, tuned like a lute.

Scalloped fretboard: Scalloping involves the wood between some or all of the frets being scooped out. This allows a lighter touch for a more precise playing while executing bends or vibratos (since there's no contact between the fingertips and the wooden part of the fingerboard). Even if some people think that it's used to play faster, it's not the case; it's even harder to play fast comparatively to non-scalloped instruments. It has some popularity with musicians playing heavy metal music, although the concept can also be seen in more ancient instruments such as the sitar.

Retractable frets: In a retractable fret system, the frets on the fingerboard are designed to withdraw into the fingerboard and flush with the surface. This produces a smooth fingerboard surface like that of a fretless instrument, and allows the instrument to played as such. This lends versatility by allowing players to switch between fretted and fretless characteristics on the same instrument rather than forcing them to carry two separate instruments or a double-necked instrument. However, in practice, the current design requires the mechanism to be housed in the base of neck, occupying a significant amount of space just below the fingerboard surface. This prevent frets from being inserted into the top of the housing and reduces its musical range as a fretted instrument, although the housing may still be used as a fretless fingerboard surface.[1]

Semi-fretted instruments

It is also possible to find semi-fretted instruments; examples include the Malagasy kabosy and the Afghan Rubab. Semi-fretted versions of guitars and other fretted string instruments, however, are usually one-off, custom adaptations made for players who want to combine elements of both types of sound. One arrangement is for the frets to extend only part of the way along the neck so that the higher notes can be played with the smooth expression possible with a fretless fingerboard. Another approach is the use of frets that extend only partway across the fretboard so that some courses of strings are fretted and others fretless, for example Ryszard Latecki's Latar.

Fret intonation

Instruments with straight frets like guitars require a special compensation on the saddle and nut. Every time a string is fretted it is also stretched, and as it stretches the string rises in pitch, making all fretted tones sound sharp. When the saddle is positioned properly, however, the fretted tones all sound sharp to the same degree as long as the distances between the frets are correct. With the right nut compensation, the pitch of the unfretted string can be raised by the same amount. As a result, when the tension of the strings is lowered, the pitches of all notes, both fretted and unfretted, becomes correct.

Fret wear

On instruments equipped with steel strings, such as folk guitars and electric guitars, frets are eventually bound to wear down as the strings cut grooves into them. When this happens, the instrument may need refretting (the frets are removed and replaced) or, in less severe cases, "fret dressing" (the frets are leveled, polished, and possibly recrowned). Often, a few fret dressings can be performed on a guitar before it requires complete refretting.

Tied gut frets, used on instruments such as the lute or viol, wear quickly, and must be replaced regularly.

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Up to date as of January 14, 2010
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Simple English

Frets are thin metal strips which are used on several stringed musical instruments, such as the guitar, the electric guitar, the bass guitar, the mandolin, and the banjo.

These thin metal strips are mounted on the long necks of these stringed instruments. The frets help the musician playing the instrument to know where to place their fingers on the instrument.









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