It is characterized by:

• Eight metal strings in four pairs (courses) that are plucked with a plectrum,
• A body with a teardrop-shaped soundtable (i.e. face), or one that is essentially oval in shape,
• A neck with a flat (or slightly radiused) fretted fingerboard, and a nut and floating bridge,
• A tailpiece or pinblock at the edge of the face to which the strings are attached
• Mechanical tuning machines, rather than friction pegs,
• A soundtable with a soundhole, or soundholes, of varying shapes that are open and not latticed. ^{[1] [2]}

Mandolin forms

Mandolins come in several forms. The Neapolitan style, known as a round-back or bowl-back, (or "tater-bug," colloquial American), has a vaulted back made of a number of strips of wood in a bowl formation, similar to a lute, and usually a canted, two-plane, uncarved top. The Portuguese bandolim, a flat-back style, is derived from the cittern, but is tuned the same as most mandolins. Another form has a banjo-style body.

At the very end of the nineteenth century, a new style, with carved top and back construction inspired by violin family instruments began to supplant the European-style bowl-back instruments, especially in the United States. This new style is credited to mandolins designed and built by Orville Gibson, a Kalamazoo, Michigan violinmaker who founded the "Gibson Mandolin-Guitar Manufacturing Co., Limited." in 1902. Gibson mandolins evolved into two basic styles: the Florentine or F-style, which has a decorative scroll near the neck, two points on the lower body, and usually a scroll carved into the headstock; and the A-style, which is pear shaped, has no points, and usually has a simpler headstock.

These styles generally have either two f-shaped soundholes like a violin (F-5 and A-5), or an oval sound hole (F-4 and A-4 and lower models) directly under the strings. Much variation exists between makers working from these archetypes, and other variants have become increasingly common. The Gibson F-hole F-5-style mandolins have come to be considered the most typical and traditional for playing American bluegrass music, while the A-style is generally more associated with Irish, folk, or classical music. The differences are more than cosmetic or aesthetic since the F-hole models have a distinctly different sound than the A-style models. The more complicated woodwork also translates into a more expensive instrument.

Internal bracing in the F-style mandolins was usually achieved with parallel tone bars, similar to a violin's bassbar. Some makers instead employ "x-bracing" which is simply two tone bars mortised to each other to cross into an X supporting the top. Some luthiers are now using a "modified x-bracing," which incorporates both a tone bar and x-bracing.

Numerous modern mandolin makers build instruments that are largely replicas of the Gibson F-5 Artist models built in the early 1920s by Gibson acoustician Lloyd Loar. Original Loar-signed instruments are sought after and extremely valuable.

Example of an oval-hole A-style mandolin

Other American-made variants include the Howe-Orme guitar-shaped mandolin (manufactured by the Elias Howe Company between 1897 and roughly 1920), which featured a cylindrical bulge along the top from fingerboard end to tailpiece, and the Vega mando-lute (more commonly called a cylinder-back mandolin manufactured by the Vega Company between 1913 and roughly 1927), which had a similar longitudinal bulge but on the back rather than the front of the instrument.

As with almost every other contempary string instrument, another modern variant is the electric mandolin. These mandolins can have four (single), five (single) or eight (double) strings.

Mandolin family

The mandolin is the soprano member of the mandolin family, as the violin is the soprano member of the violin family. Like the violin, its scale length is typically about 13 inches (330 mm). Modern American mandolins modeled after Gibsons have a longer scale, about 13-7/8" (352mm).

Other members of the mandolin family are:

• The mandola (US and Canada), termed the tenor mandola in Europe, Ireland and the UK, which is tuned to a fifth below the mandolin, in the same relationship as that of the viola to the violin. Some also call this instrument the "alto mandola." Its scale length is typically about 16.5 inches (420 mm). It is normally tuned like a viola: C-G-D-A.

• The octave mandolin (US and Canada), termed the octave mandola or mandole in Europe, Ireland, and the UK, which is tuned an octave below the mandolin. Its scale length is typically about 20 inches (500 mm), although instruments with scales as short as 17 inches (430 mm) or as long as 21 inches (530 mm) are not unknown.

• The mandocello, which is classically tuned to an octave plus a fifth below the mandolin, in the same relationship as that of the cello to the violin: C-G-D-A. Today, it is not infrequently restrung for octave mandolin tuning or the Irish bouzouki's GDAD. Its scale length is typically about 25 inches (635 mm). A typical violoncello scale is 27" (686mm).

• The Greek laouto is essentially a mandocello, ordinarily tuned D-G-D-A, with half of each pair of the lower two courses being tuned an octave high on a lighter gauge string. The body is a staved bowl, the saddle-less bridge glued to the flat face like most ouds and lutes, with mechanical tuners, steel strings and tied gut frets. Modern laoutos, as played on Crete, have the entire lower course tuned in octaves as well as being tuned a reentrant octave above the expected D. Its scale length is typically about 28 inches (712mm).

• The mando-bass, has 4 single strings, rather than double courses, and is tuned like a double bass. These were made by the Gibson company in the early twentieth century, but appear to have never been very common. Reportedly, most mandolin orchestras preferred to use the ordinary double bass, rather than a specialised mandolin family instrument. Calace and other Italian makers predating Gibson also made mandolin-basses.

• The piccolo or sopranino mandolin is a rare member of the family, tuned one octave above the tenor mandola and one fourth above the mandolin; the same relation as that of the piccolo or sopranino violin to the violin and viola. One model was manufactured by the Lyon & Healy company under the Leland brand. A handful of contemporary luthiers build piccolo mandolins, including Stephen Gilchrist of Australia and Jamie Wiens of Canada. Its scale length is typically about 9.5 inches (240 mm).

• The Irish bouzouki is also considered a member of the mandolin family; although derived from the Greek bouzouki, it is constructed like a flat backed mandolin and uses fifth-based tunings (most often GDAD, an octave below the mandolin, sometimes GDAE, ADAD or ADAE) in place of the guitar-like fourths-and-third tunings of the three- and four-course Greek bouzouki. Although the bouzouki's bass course pairs are most often tuned in unison, on some instruments one of each pair is replaced with a lighter string and tuned in octaves, in the fashion of the 12-string guitar. Although occupying the same range as the octave mandolin/octave mandola, the Irish bouzouki is distinguished from the former instrument by its longer scale length, typically from 22 inches (560 mm) to 24 inches (610 inches), although scales as long as 26 inches (660 mm), which is the usual Greek bouzouki scale, are not unknown.

• The modern cittern is also an extension of the mandolin family, being typically a five course (ten string) instrument having a scale length between 20 inches (500 mm) and 22 inches (560 mm). It is most often tuned to either DGDAD or GDADA, and is essentially an octave mandola with a fifth course at either the top or the bottom of its range. Some luthiers, such as Stefan Sobell also refer to the octave mandola or a shorter-scaled Irish bouzouki as a cittern, irrespective of whether it has four or five courses.

• In Indian classical music and Indian light music, the mandolin, which bears little resemblance to the European mandolin, is likely to be tuned to E-B-E-B. As there is no concept of absolute pitch in Indian Classical music, any convenient tuning maintaining these relative pitch intervals between the strings to can be used. Another prevalent tuning with these intervals is C-G-C-G, which corresponds to Sa-Pa-Sa-Pa in the Indian carnatic classical music style. This tuning corresponds to the way violins are tuned for carnatic classical music.

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