An electric guitar is a type of guitar that uses pickups to convert the vibration of its steel-cored strings into an electrical current, which is made louder with an instrument amplifier and a speaker. The signal that comes from the guitar is sometimes electronically altered with guitar effects such as reverb or distortion. While most electric guitars have six strings, seven-string instruments are used by some jazz guitarists and metal guitarists (especially in nu metal ), and 12-string electric guitars (with six pairs of strings, four of which are tuned in octaves) are used in genres such as jangle pop and rock.
The electric guitar was first used by jazz guitarists, who used amplified hollow-bodied instruments to get a louder sound in Swing-era big bands. The earliest electric guitars were hollow bodied acoustic instruments with tungsten pickups made by the "Rickenbacker" company in 1931. While one of the first solid-body guitars was invented by Les Paul, the first commercially successful solid-body electric guitar was the Fender Esquire (1946). The electric guitar was a key instrument in the development of many musical styles that emerged since the late 1940s, such as Chicago blues, early rock and roll and rockabilly, and 1960s blues rock. It is also used in a range of other genres, including country music, ambient (or "new-age"), and in some contemporary classical music.
The need for an amplified guitar became apparent during the big band era, as jazz orchestras of the 1930s and 1940s increased in size, with larger brass sections. Initially, electric guitars used in jazz consisted primarily of hollow archtop acoustic guitar bodies to which electromagnetic transducers had been attached.
 Early years
Electric guitars were originally designed by an assortment of luthiers, guitar makers, electronics enthusiasts, and instrument manufacturers. Guitar innovator Les Paul experimented with microphones attached to guitars. Some of the earliest electric guitars adapted hollow bodied acoustic instruments and used tungsten pickups. This type of guitar was manufactured beginning in 1931 by Electro String Instrument Corporation in Los Santos under the direction of Adolph Rickenbacher and George Beauchamp. Their first design was built by Harry Watson, a craftsman who worked for the Electro String Company. This new guitar which the company called "Rickenbackers" would be the first of its kind.
The earliest documented performance with an electric guitar was in 1932, by guitarist and bandleader Gage Brewer. The Wichita, Kansas-based musician had obtained two instruments from George Beauchamp of Los Angeles, California, and he publicized his new instruments in an article in the Wichita Beacon, October 2, 1932 and through a performance later that month. The first recording of an electric guitar was by jazz guitarist George Barnes who recorded two songs in Chicago on March 1st, 1938: Sweetheart Land and It's a Low-Down Dirty Shame. Many historians incorrectly attribute the first recording to Eddie Durham, but his recording with the Kansas City Five was not until 15 days later. Durham introduced the instrument to a young Charlie Christian, who made the instrument famous in his brief life and is generally known as the first electric guitarist and a major influence on jazz guitarists for decades thereafter.
The first recording of an electric guitar west of the Mississippi was in Dallas, in September 1935, during a session with Roy Newman and His Boys, an early Western swing dance band. Their guitarist, Jim Boyd, used his electrically-amplified guitar during the recording of three songs, "Hot Dog Stomp" (DAL 178-Vo 03371), "Shine On, Harvest Moon" (DAL 180-Vo 03272), and "Corrine, Corrina" (DAL 181-Vo/OK 03117). An even earlier Chicago recording of an electrically amplified guitar—albeit an amplified lap steel guitar—was during a series of session by Milton Brown and His Brownies (another early Western swing band) that took place January 27-28, 1935, wherein Bob Dunn played his amplified Hawaiian guitar.
The version of the instrument that is best known today is the solid body electric guitar, a guitar made of solid wood, without resonating airspaces within it. Rickenbacher, later spelled Rickenbacker, did, however, offer a cast aluminum electric steel guitar, nicknamed The Frying Pan or The Pancake Guitar, beginning in 1931. This guitar is reported to have sounded quite modern and aggressive when tested by vintage guitar researcher John Teagle. The company Audiovox built and may have offered an electric solid-body as early as the mid-1930s.
Another early solid body electric guitar was designed and built by musician and inventor Les Paul in the early 1940s, working after hours in the Epiphone Guitar factory. His log guitar (so called because it consisted of a simple 4x4 wood post with a neck attached to it and homemade pickups and hardware, with two detachable Swedish hollow body halves attached to the sides for appearance only) was patented and is often considered to be the first of its kind, although it shares nothing in design or hardware with the solid body "Les Paul" model sold by Gibson. In 1945, Richard D. Bourgerie made an electric guitar pickup and amplifier for professional guitar player George Barnes. Bourgerie worked through World War II at Howard Radio Company making electronic equipment for the American military. Mr. Barnes showed the result to Les Paul, who then arranged for Mr. Bourgerie to have one made for him.
In 1946, radio repairman and instrument amplifier maker Clarence Leonidas Fender—better known as Leo Fender—through his eponymous company, designed the first commercially successful solid-body electric guitar with a single magnetic pickup, which was initially named the "Esquire". This was a departure from the typically hollow-bodied Jazz-oriented instruments of the time and immediately found favor with Country-Western artists in California. The two-pickup version of the Esquire was called the "Broadcaster". However, Gretsch had a drumset marketed with a similar name (Broadkaster), so Fender changed the name to "Telecaster".
Features of the Telecaster included: an ash body; a maple 25½" scale, 21-fret or 22-fret neck attached to the body with four-bolts reinforced by a steel neckplate; two single-coil, 6-pole pickups (bridge and neck positions) with tone and volume knobs, pickup selector switch; and an output jack mounted on the side of the body. A black bakelite pickguard concealed body routings for pickups and wiring. The bolt-on neck was consistent with Leo Fender's belief that the instrument design should be modular to allow cost-effective and consistent manufacture and assembly, as well as simple repair or replacement. Due to the earlier mentioned trademark issue, some of the first production Telecasters were delivered with headstock decals with the Fender logo but no model identification. These are today very much sought after, and commonly referred to by collectors as "Nocasters".
In 1954, Fender introduced the Fender Stratocaster, or "Strat." The Strat was seen as a deluxe model and offered various product improvements and innovations over the Telecaster. These innovations included a well dried ash or alder double-cutaway body design for bridge assembly with an integrated spring vibrato mechanism (called a synchronized tremolo by Fender, thus beginning a confusion of the terms that still continues), three single-coil pickups, and body comfort contours. Leo Fender is also credited with developing the first commercially-successful electric bass guitar called the Fender Precision Bass, introduced in 1951.
In 1962 Vox introduced the pentagonal Phantom guitar, originally made in England but soon after made by Alter EKO of Italy. It was followed a year later by the teardrop-shaped Mark VI, the prototype of which was used by Brian Jones of The Rolling Stones, and later Johnny Thunders of the New York Dolls. Vox guitars also experimented with onboard effects and electronics. In the mid 1960s, as the sound of electric 12-string guitars became popular, Vox introduced the Phantom XII and Mark XII electric 12-string guitars as well as the Tempest XII which employed a more conventional Fender style body and thus is often overlooked as a Vox classic from the Sixties. The few that were manufactured also came from Italy. Vox also produced other traditional styles of 6- and 12-string electric guitars in both England and Italy, The 12-string electric guitars had a much larger neck and body and averaged at the weight of 26.4 pounds(11.9kg), they were also played on tables such as a piano or other sit down instrument.
While guitar construction has many variations, in terms of the materials used for the body, the shape of the body, and the configuration of the neck, bridge, and pickups, there are features which are found in almost every guitar. The photo below shows the different parts of an electric guitar. The headstock(1) contains the metal machine heads, which are used for tuning ; the nut(2), a thin fret-like strip of metal or plastic which the strings pass over as they first go onto the fingerboard; the machine heads (3), which are worm gears which the player turns to change the string tension and thus adjust the tuning; the frets(4), which are thin metal strips which stop the string at the correct pitch when a string is pressed down against the fingerboard; the truss rod(5) , a metal cylinder used for adjusting the tension on the neck (not found on all instruments); decorative inlay (6), a feature not found on lower-cost instruments.
The neck and the fretboard (7) extend from the body; at the neck joint (8), the neck is either glued or bolted to the body; the body (9)- in this instrument, it is made of wood which is painted and lacquered, but some guitar bodies are also made of polycarbonate or other materials ; pickups (10), which are usually magnetic pickups, but which may also be piezoelectric transducer pickups; the control knobs (11) for the volume and tone potentiometers ; a fixed bridge(12)-on some guitars, a spring-loaded hinged bridge called a "tremolo system" is used instead, which allows players to "bend" notes or chords down in pitch or perform a vibrato embellishment; and a plastic pickguard(13), a feature not found on all guitars, which is used to protect the body from scratches.
The wood that the body (9) is made of largely determines the sonic qualities of the guitar. Typical woods include alder(brighter, but well rounded), swamp ash(similar to alder, but with more pronounced highs and lows), mahogany(dark, bassy, warm), poplar(similar to mahogany) and basswood(very neutral). Maple, a very bright tonewood, is also a popular body wood, but is very heavy. For this reason it is often placed as a 'cap' on a guitar made of primarily of another wood. Cheaper guitars are often times made of cheap woods sound sterile and lifeless, such as plywood or agathis.
Compared with an acoustic guitar, which has a hollow body, electric guitars make comparatively little audible sound simply by having their strings plucked, and so electric guitars are normally plugged into a guitar amplifier, which makes the sound louder. When an electric guitar is strummed, the movement of the strings generates (i.e., "induces") a very small electrical current in the magnetic pickups, which are magnets wrapped with coils of very fine wire. That current is then sent via a cable to a guitar amplifier. The current induced is proportional to such factors as the density of the string or the amount of movement over these pickups. That vibration is, in turn, affected by several factors, such as the composition and shape of the body.
Some hybrid electric-acoustic guitars are equipped with additional microphones or piezoelectric pickups (transducers) that sense mechanical vibration from the body. Because in some cases it is desirable to isolate the pickups from the vibrations of the strings, a guitar's magnetic pickups will sometimes be embedded or "potted" in epoxy or wax to prevent the pickup from having a microphonic effect.
Because of their natural inductive qualities, all magnetic pickups tend to pick up ambient and usually unwanted electromagnetic noises. The resulting noise, the so-called "hum", is particularly strong with single-coil pickups, and aggravated by the fact that very few guitars are correctly shielded against electromagnetic interference. The most frequent cause is the strong 50 or 60 Hz component that is inherent in the frequency generation of current within the local power transmission system. As nearly all amplifiers and audio equipment associated with electrical guitars rely on this power, there is in theory little chance of completely eliminating the introduction of unwanted hum.
Double-coil or "humbucker" pickups were invented as a way to reduce or counter the unwanted ambient hum sounds. Humbuckers have two coils of opposite magnetic and electric polarity. This means that electromagnetic noise hitting both coils should cancel itself out. The two coils are wired in phase, so the signal picked up by each coil is added together. This creates the richer, "fatter" tone associated with humbucking pickups. Optical pickups  are a type of pickup which sense string and body vibrations using infrared LED light.
 Tremolo arms
Some electric guitars have a tremolo arm (sometimes called a "whammy bar" or a "vibrato bar" and occasionally abbreviated as trem), a lever attached to the bridge which can slacken or tighten the strings temporarily, changing the pitch, thereby creating a vibrato effect. Early tremolo systems, such as the Bigsby vibrato tailpiece, tended to be unreliable and cause the guitar to go out of tune quite easily, and also had a limited range. Later Fender designs were better, but Fender held the patent on these, so other companies used Bigsby-style tremolo for many years.
With the expiration of the Fender patent on the Stratocaster-style tremolo, various improvements on this type of internal, multi-spring tremolo system are now available. Floyd Rose introduced one of the first improvements on the vibrato system in many years when in the late 1970s he began to experiment with "locking" nuts and bridges which work to prevent the guitar from losing tuning even under the most heavy whammy bar acrobatics.
 Guitar necks
Electric guitar necks can vary according to composition as well as shape. The primary metric used to describe a guitar neck is the scale, which is the overall length of the strings from the nut to the bridge. A typical Fender guitar uses a 25.5 inch scale, while Gibson uses a 24.75 inch scale in their Les Paul. The frets are placed proportionally according to the scale length, so the smaller the scale, the tighter the spacing of the frets.
Necks are described as bolt-on, set-in, or neck-through depending on how they are attached to the body. Set-in necks are glued to the body in the factory, and are said to have a warmer tone and greater sustain; this is the most traditional type of joint. Bolt-on necks were pioneered by Leo Fender to facilitate easy adjustment and replacement of the guitar neck. Neck-through instruments extend the neck itself to form the center of the guitar body, and are known for long sustain and for being particularly sturdy. While a set neck can be carefully unglued by a skilled luthier, and a bolt-on neck can simply be unscrewed, a neck-through design is difficult or even impossible to repair, depending on the damage. Historically, the bolt-on style has been more popular for ease of installation and adjustment; since bolt-on necks can be easily removed, there is an after-market in replacement bolt-on necks from companies such as Warmoth and Mighty Mite. Some instruments, notably most Gibson models, have continued to use set/glued necks. Neck-through bodies are somewhat more common in bass guitars.
The materials used in the manufacture of the neck have great influence over the tone of the instrument. Hardwoods are very much preferred, with maple, ash, and mahogany topping the list. The neck and fingerboard can be made from different materials, such as a maple neck with a rosewood fingerboard. In the 1980s, exotic man-made materials such as graphite began to be used, but are pricey and never really replaced wood in production instruments. Such necks can be retrofitted to existing bolt-on instruments.
There are several different neck shapes used on guitars, including shapes known as C necks, U necks, and V necks. These refer to the cross-sectional shape of the neck (especially near the nut). There are also several sizes of fret wire available, with traditional players often preferring thin frets, and metal shredders liking thick frets. Thin frets are considered better for playing chords, while thick frets allow lead guitarists to bend notes with less effort. An electric guitar with a neck which folds back called the "Foldaxe" was designed and built for Chet Atkins by Roger Field (featured in Atkins' book "Me and My Guitars."). Steinberger guitars developed a line of exotic instruments without headstocks, with tuning done on the bridge instead.
 Sound and effects
While an acoustic guitar's sound is largely dependent on the vibration of the guitar's body and the air within it, the sound of an electric guitar is largely dependent on a magnetically induced electrical signal, generated by the vibration of metal strings near sensitive pickups. The signal is then "shaped" on its path to the amplifier by using a range of effect devices or circuits that modify the tone and characteristics of the signal. The most basic sound-shaping circuitry are the volume control (potentiometer), tone control (which "rolls off" the treble frequencies), and the pick-up selectors which are found on most electric guitars, and the gain and tone (usually consisting of at least bass and treble) controls on the guitar amplifier.
In the 1960s, some guitarists began exploring a wider range of tonal effects by distorting the sound of the instrument. To do this, they increased the gain, or volume, of the preamplifier, which produced a "fuzzy" sound. This effect is called "clipping" by sound engineers, because when viewed with an oscilloscope, the wave forms of a distorted signal appear to have had their peaks "clipped" off. This was not actually a new development in the instrument, but rather a shift of aesthetics. This sound was not generally recognized previously as desirable. In the 1960s, the tonal palette of the electric guitar was further modified by introducing an effects box in its signal path. Traditionally built in a small metal chassis with an on/off foot switch, such "stomp boxes" have become an important part of the electric guitar tone in many genres. Typical effects include stereo chorus, fuzz, wah-wah and flanging, compression/sustain, delay, reverb, and phase shift. Not all special effects are electronic; in 1967, guitarist Jimmy Page of The Yardbirds created unusual, psychedelic sound effects by playing the electric guitar with a violin bow and smacking the strings with the bow.
In the 1970s, as effects pedals proliferated, their sounds were combined with power-tube distortion at lower, more controlled volumes by using power attenuators such as Tom Scholz' Power Soak as well as re-amplified dummy loads such as Eddie Van Halen's use of a variac, power resistor, post-power-tube effects, and a final solid-state amp driving the guitar speakers. A variac is one approach to power-supply based power attenuation, to make the sound of power-tube distortion more practically available.
By the 1980s and 1990s, digital and software effects became capable of replicating the analog effects used in the past. These new digital effects attempted to model the sound produced by analog effects and tube amps, to varying degrees of quality. There are many free guitar effects computer programs for PCs that can be downloaded from the Internet. By the 2000s, PCs with specially-designed sound cards could be used as digital guitar effects processors. Although digital and software effects offer many advantages, many guitarists still use analog effects.
In 2002, Gibson announced the first digital guitar, which performs analog-to-digital conversion internally. The resulting digital signal is delivered over a standard Ethernet cable, eliminating cable-induced line noise. The guitar also provides independent signal processing for each individual string. Also, in 2003 amp maker Line 6 released the Variax guitar. It differs in some fundamental ways from conventional solid-body electrics. For example it uses piezoelectric pickups instead of the conventional electromagnetic ones, and has an onboard computer capable of modifying the sound of the guitar to model the sound of many instruments.
 Solid body
Solid body electric guitars have no hollow internal cavity to accommodate vibration and no sound holes such as those used to amplify string vibrations in acoustic guitars. Solid body instruments are generally made of hardwood with a lacquer coating and have six steel strings. The wood is dried for 3 to 6 months in heated storage before being cut to shape. The sound that is audible in music featuring electric guitars is produced by pickups on the guitar that convert the string vibrations into an electrical signal. The signal is then fed to an amplifier (or amp) and speaker.
One of the first solid body guitars was invented by Les Paul. Gibson did not present their 'Les Paul' guitar prototypes to the public, as they did not believe it would catch on. The first mass-produced solid-body guitar was Fender's Broadcaster (later to become the 'Telecaster') first made in 1948, five years after Les Paul made his prototype. The Gibson Les Paul appeared soon after to compete with the Broadcaster.
 Hollow body
These guitars have a hollow body and electronic pickups mounted on its body. They work in a similar way to solid body electric guitars except that because the hollow body also vibrates, the pickups convert a combination of string and body vibration into an electrical signal. A variant form, the semi-hollow body guitar, strikes a balance between the characteristics of solid-body and hollow-body guitars. Advocates of semi-hollow-body guitars argue that they have greater resonance and sustain than true solid-body guitars, as well as lighter overall weight. Typically, a semi-hollow body guitar will have a form factor more similar to a solid-body electric guitar, and may include two sound holes, one, or none.
 Metal body
A number of metal-bodied guitars have worked with the unique acoustic/sustaining qualities of metal. These are not hollow-bodied guitars, like a blues steel-bodied guitar, although most are chambered for weight; instead, these metal-bodied guitars are built to play as a solid wood body. Several metal bodies were made in the 1950s by violin and cello makers. In the 1970s, John Veleno made a polished aluminum guitar. Liquid Metal Guitars makes a metal body guitar made out of a solid block of alumimum and then chrome or gold-plates the instrument. Many guitars otherwise sold as solid-bodied instruments, such as the Gibson Les Paul or the PRS Singlecut, are built with "weight relief" holes bored into the body which affect the sound of the instrument. The Les Paul Supreme edition is currently described by the manufacturer as a "chambered" instrument, with a weight relief system designed to positively affect the sound.
Some steel-string acoustic guitars are fitted with pickups purely as an alternative to using a separate microphone.These guitars are made out of fiber and sodium chloroplast. They may also be fitted with a piezo-electric pickup under the bridge, attached to the bridge mounting plate, or with a low mass microphone (usually a condenser mic) inside the body of the guitar that will convert the vibrations in the body into electronic signals, or even combinations of these types of pickups, with an integral mixer/preamp/graphic equalizer. These are called electric acoustic guitars, and are regarded as acoustic guitars rather than electric guitars because the pickups do not produce a signal directly from the vibration of the strings, but rather from the vibration of the guitar top or body. These should not be confused with hollow body electric guitars, which have pickups of the type found on solid body electric guitars.
 String, bridge, and neck variants
 Fewer than six
Although rare, the one-string guitar is sometimes heard, particularly in Delta blues, where improvised folk instruments were popular in the 1930s and 1940s. Eddie "One String" Jones had some regional success with a Mississippi blues musician Lonnie Pitchford played a similar, homemade instrument. In a more contemporary style, Little Willie Joe, the inventor of the Unitar, had a rhythm and blues instrumental hit in the 1950s with "Twitchy", recorded with the Hall Orchestra. The best-known exponent of the four-string guitar, often called the tenor guitar was Tiny Grimes, who played on 52nd Street with the beboppers and played a major role in the Prestige Blues Swingers. Grimes' guitar omitted the bottom two strings. Deron Miller of CKY only uses four strings, but plays a six string guitar with the two highest strings removed. Many banjo players use this tuning: DGBE, mostly in Dixieland. Guitar players find this an easier transition than learning plectrum or tenor tuning.
Most Seven-string guitars add a low "B" string below the low "E". Both electric and classical guitars exist designed for this tuning. A high "A" string above the high "E" instead of the low "B" is sometimes used. Another less common seven-string arrangement is a second G string situated beside the standard G string and tuned an octave higher, in the same manner as a twelve-stringed guitar (see below). Jazz guitarists using a seven-string include veteran jazz guitarists George Van Eps, Bucky Pizzarelli and his son John Pizzarelli.
Seven-string electric guitars were popularized among rock players in the 1980s by Steve Vai. Along with the Japanese guitar company Ibanez, Vai created the Universe series seven string guitars in the 1980s, with a double locking tremolo system for a seven string guitar. These models were based on Vai's six string signature series, the Ibanez Jem. Seven-string guitars experienced a resurgence in popularity in the 2000s, championed by Korn, Fear Factory, Strapping Young Lad, Nevermore, and other hard rock/metal bands. Metal musicians often prefer the seven-string guitar for its extended lower range. The seven-string guitar has also played an essential role in progressive rock, and is commonly used in bands such as Dream Theater and by experimental guitarists such as Ben Levin.
 Eight and nine-string
Eight-string electric guitars are rare, but not unused. One is played by Charlie Hunter (manufactured by Novax Guitars). The largest manufacturer of 8- to 14-strings is Warr Guitars. Their models are used by Trey Gunn (ex King Crimson) who has his own signature line from the company. Also, Mårten Hagström and Fredrik Thordendahl of Meshuggah used 8-string guitars made by Nevborn Guitars and now guitars by Ibanez. Munky of nu metal band Korn is also known to use eight-string Ibanez guitars and it is rumoured that he is planning to release a K8 eight-string guitar similar to his K7 seven-string guitar. In 2008 Ibanez released the Ibanez RG2228-GK which is the first mass produced eight-string guitar. Jethro Tull's first album uses a nine-string guitar on one track. Josh Smith of the band The Fucking Champs plays a 9-string guitar, with two G, B, and high E strings each, tuned in unison.
Twelve string electric guitars feature six pairs of strings, usually with each pair tuned to the same note. The extra E, A, D, and G strings add a note one octave above, and the extra B and E strings are in unison. The pairs of strings are played together as one, so the technique and tuning are the same as a conventional guitar, although creating a much fuller tone. They are used almost solely to play harmony and rhythm. They are relatively common in folk rock music. Lead Belly is the folk artist most identified with the twelve-string guitar, usually acoustic with a pickup.
George Harrison of The Beatles and Roger McGuinn of The Byrds brought the electric twelve-string to notability in rock and roll. During the Beatles' first trip to the US, in February 1964, Harrison received a new "360/12" model guitar from the Rickenbacker company, a 12-string electric made to look onstage like a 6-string. He began using the 360 in the studio on Lennon's "You Can't Do That" and other songs. Roger McGuinn began using electric 12-string guitars to create the jangly sound of The Byrds. Another notable guitarist to utilize electric 12-string guitars is Jimmy Page, the guitarist with proto-heavy metal and rock group Led Zeppelin.
 3rd bridge
The 3rd bridge guitar is an electric prepared guitar with an additional 3rd bridge. This can be a normal guitar with for instance a screwdriver placed under the strings, but can also be a custom made instrument. Lee Ranaldo of Sonic Youth plays with a 3rd bridge.
 Double neck guitars
Double-neck (or, less commonly, "twin-neck") guitars enable guitarists to play guitar and bass guitar or, more commonly, a six-string and twelve-string. The double-neck guitar was popularized by Jimmy Page, who used a custom-made Gibson EDS-1275 to perform the Led Zeppelin song "Stairway to Heaven". Guitarist Don Felder also used the Gibson EDS-1275 during the Hotel California tour.
There were also some double necks that had two six-string necks with different pickup configurations. The most popular 6 and 6 were made by Ibanez in the early 1980s, which were copies of the Gibson SG style 6 and 12, and were also referred to as the "pre-lawsuit" guitars. Ibanez stopped production when they lost a lawsuit to Gibson. The Gibson 6-string and 12-string was also popularized by the Eagles song "Hotel California".
English progressive rock bands such as Genesis used custom-made double-neck instruments produced by the Shergold company. Rick Nielsen, guitarist for Cheap Trick, uses a variety of custom guitars mostly made by Hamer Guitars, many of which have five necks, with the strap attached to the body by a swivel so that the guitar can be rotated to put any neck into playing position. Guitarist Steve Vai occasionally uses a triple-neck guitar; one neck is twelve string, one is six string and the third is a fretless six-string. In the 2000s, a small number of boutique guitar makers produce specialty instruments with up to six necks on a guitar, consisting of various guitar necks with different stringing and/or "drone" strings which are designed to vibrate sympathetically.
 Popular music
Popular music and rock groups often use the electric guitar in two roles: as a rhythm guitar which provides the chord sequence or "progression" and sets out the "beat" (as part of a rhythm section), and a lead guitar, which is used to perform melody lines, melodic instrumental fill passages, and guitar solos. In some rock or metal bands with two guitarists, the two performers may perform as a guitar tandem, and trade off the lead guitar and rhythm guitar roles. In bands with a single guitarist, the guitarist may switch between these two roles, playing chords to accompany the singer's lyrics, and then playing a guitar solo in the middle of the song.
In the most commercially available and consumed pop and rock genres, electric guitars tend to dominate their acoustic cousins in both the recording studio and the live venue, especially in the "harder" genres such as heavy metal and hard rock. However the acoustic guitar remains a popular choice in country, western and especially bluegrass music, and it is widely used in folk music.
 Jazz and jazz fusion
Jazz guitar playing styles include rhythm guitar-style "comping" (accompanying) with jazz chord voicings (and in some cases, walking basslines) and "blowing" (improvising solos) over jazz chord progressions with jazz-style phrasing and ornaments. The accompanying style for electric guitar in most jazz styles differs from the way chordal instruments accompany in many popular styles of music. In rock and pop, the rhythm guitarist usually performs the chords in rhythmic fashion which sets out the beat of a tune. In contrast, in many modern jazz styles, the guitarist plays much more sparsely, interminging periodic chords and delicate voicings into pauses in the melody or solo. Jazz chord voicings are usually rootless and emphasize the 3rd and 7th notes of the chord.
When jazz guitar players improvise, they use the scales, modes, and arpeggios associated with the chords in a tune's chord progression. Jazz guitarists have to learn how to use scales (whole tone scale, chromatic scale, etc.) to solo over chord progressions. Jazz guitar improvising is not merely the recitation of jazz scales and rapid arpeggios. Jazz guitarists often try to imbue their melodic phrasing with the sense of natural breathing and legato phrasing used by horn players such as saxophone players. As well, a jazz guitarists' solo improvisations have to have a rhythmic drive and "timefeel" that creates a sense of "swing" and "groove".
Jazz guitarists typically favor hollowbody instruments; solidbody guitars are also used.
 Contemporary classical music
Until the 1950s, the acoustic, nylon-stringed classical guitar was the only type of guitar favored by classical, or art music composers. In the 1950s a few contemporary classical composers began to use the electric guitar in their compositions. Examples of such works include Karlheinz Stockhausen's Gruppen (1955-57); Donald Erb's String Trio (1966), Morton Feldman's The Possibility of a New Work for Electric Guitar (1966); George Crumb's Songs, Drones, and Refrains of Death (1968); Hans Werner Henze's Versuch über Schweine (1968); Francis Thorne's Sonar Plexus (1968) and Liebesrock (1968–69), Michael Tippett's The Knot Garden (1965-70); Leonard Bernstein's MASS (1971) and Slava! (1977); Louis Andriessen's De Staat (1972-76); Steve Reich's Electric Counterpoint (1987), Arvo Pärt's Miserere (1989/92), and countless works composed for the quintet of Ástor Piazzolla.
In the 1980s and 1990s, a growing number of composers (many of them composer-performers who had grown up playing the instrument in rock bands) began writing contemporary classical music for the electric guitar. These include Shawn Lane, Steven Mackey, Nick Didkovsky, Scott Johnson, Lois V Vierk, Tim Brady, Tristan Murail, John Rogers, and Randall Woolf. Yngwie Malmsteen released his Concerto Suite for Electric Guitar and Orchestra in 1998, and Steve Vai released a double-live CD entitled Sound Theories, of his work with the Netherlands Metropole Orchestra in June 2007. The American composers Glenn Branca and Rhys Chatham have written "symphonic" works for large ensembles of electric guitars, in some cases numbering up to 100 players, and the instrument is a core member of the Bang on a Can All-Stars (played by Mark Stewart). Still, like many electric and electronic instruments, the electric guitar remains primarily associated with rock and jazz music, rather than with classical compositions and performances. R. Prasanna plays a style of Indian classical music (Carnatic music) on the electric guitar.