Electric Guitar

Loud enough to lead the band

The electric guitar answers a practical problem. Early twentieth-century guitars were quiet beside brass, drums and banjos, and inventors in the United States looked for ways to amplify them. Around 1931–32, George Beauchamp, working with Adolph Rickenbacker’s company, developed an electromagnetic pickup in California, and it appeared on an aluminium lap steel guitar nicknamed the Frying Pan. A Frying Pan in a Vienna museum is dated 1934, and Beauchamp's patent, filed that year, was not granted until 1937.

Spanish-style guitars followed. By the late 1930s, hollow archtop guitars fitted with pickups were being played in jazz bands, and the guitarist Charlie Christian is often remembered for showing that an amplified guitar could take single-note solos on equal terms with horns. The claim that any one person invented the electric guitar is disputed, since makers and players in several cities worked on the idea at the same time, and the records are incomplete.

The solid body came next. Les Paul experimented with a solid plank of wood in the early 1940s, and Leo Fender brought a simple, bolt-neck solid guitar to market around 1950, first called the Broadcaster and soon renamed the Telecaster. A Fender Stratocaster followed in 1954, and other makers introduced their own designs through the decade. These instruments were cheaper to produce and less prone to feedback, and they suited the louder, younger dance and rock-and-roll music of the time.

Magnet, coil and wood

A pickup consists of a magnet wrapped in thousands of turns of very fine copper wire. When a steel string vibrates above it, the moving metal disturbs the magnetic field, and this induces a tiny alternating current in the coil that mirrors the string's motion. This is why electric guitars need strings made of magnetic metal; nylon gives no signal. Most guitars carry two or three pickups, wired to volume and tone controls and a selector switch that chooses between them.

The body can be a slab of solid wood, a chambered or semi-hollow shell, or a fully hollow archtop. A bolt-on neck, a glued-in set neck and a neck-through design are the three commonest ways of attaching the neck, and each affects sustain and repairability. Frets usually number 21 to 24, and the two common scale lengths are roughly 628 millimetres and 648 millimetres. The bridge may be fixed or attached to a tremolo arm, a lever that briefly slackens or tightens the strings to bend pitch.

The instrument is the whole signal chain

An electric guitar on its own makes little sound beyond a faint metallic rustle, since the thin body and strings move hardly any air. The voice the audience hears comes from the amplifier, which boosts the pickup's signal and shapes it through tone controls. Many players value valve, or tube, amplifiers because pushing them past their clean limit adds harmonic distortion in a way that listeners often hear as warmth or aggression.

Pickup type strongly colours the tone. Single-coil pickups, used on the Telecaster and Stratocaster, sound bright and clear but can pick up electrical hum. Humbuckers pair two coils wired to cancel that hum, and were introduced by the mid-1950s; they sound thicker and heavier. Effects pedals, including overdrive, fuzz, delay and wah, extend the palette further, so that the electric guitar is unusual in being shaped by the circuitry between player and speaker as much as by any acoustic resonance.

The same six pitches, a larger palette

Tuning matches the acoustic guitar: E2–A2–D3–G3–B3–E4, written an octave higher than it sounds. With 24 frets the top string reaches E6, giving a practical compass of four octaves, and bending a string with the fretting hand lets a player slide between pitches in a way fixed-pitch keyboards cannot. Lower tunings and seven-string models extend the bass range for heavier styles.

Timbre is unusually adjustable. Near the bridge, the tone turns thin and biting; over the neck it becomes round and dark. Clean settings preserve the pluck of each note, while heavy distortion compresses the dynamics and adds sustain, so that a note can ring until the player stops it. Feedback, the loop in which the amplifier's sound re-excites the string, can be controlled to produce long, singing tones or left as noise.

Bends, slides and hammer-ons

Because light strings and low action make notes easier to sound, electric guitarists often use techniques that would be harder on an acoustic instrument. A bend pushes the string sideways across the fret to raise its pitch; a slide glides the finger up or down the string; hammer-ons and pull-offs sound notes with the fretting hand alone, producing fast, smooth runs. Vibrato, a rapid wobble in pitch, gives sustained notes life.

The picking hand has its own vocabulary. Most players use a plectrum for speed and attack, while others pluck with fingers for chord and bass patterns. Palm muting, in which the side of the hand rests lightly on the strings near the bridge, shortens notes into a dry chug. Volume knobs and foot pedals are also played as part of the instrument, so that dynamic swells can be added without any change in the picking.

Hollow, solid and steel-on-lap

Several electric instruments belong to the guitar family. Lap steel and pedal steel guitars are played flat, with a metal bar sliding over the strings; the Frying Pan itself was a lap steel. The bass guitar, introduced in the early 1950s, reproduces the range of the double bass in a compact fretted form. Twelve-string and baritone electric guitars broaden the palette, and hybrid models combine magnetic pickups with piezoelectric ones that pick up the body's vibration directly.

Semi-hollow designs, with a solid central block and hollow wings, try to combine the warmth of an acoustic body with the stability of a solid one. Guitar synthesisers convert the signal into control data for other sounds. Acoustic guitars fitted with pickups are often called electro-acoustics; they are built like the acoustic guitar, not like the solid-body models, and are designed to work with or without amplification.

From swing bands to stadiums

Jazz was among the first established styles to adopt the electric guitar, in rhythm sections and then as a solo voice. Blues players in Chicago and elsewhere paired amplified guitars with harmonica and drums in the 1940s and 1950s, and the same lineup evolved into rock and roll. Country, soul, surf, funk, punk and metal each developed distinct playing styles and sounds, often linked to particular guitar and amplifier combinations.

The electric guitar appears in composed and experimental music too, in works for electric guitar ensembles and in scores that add it to orchestras. In popular groups it often shares the stage with Drum Kit, bass and keyboard, and in studio recording a single player may layer many parts. Les Paul is honoured by the Rock and Roll Hall of Fame for his work on multitrack recording as well as the guitar.

Strings, setup and safe handling

Electric guitars need regular attention to stay playable. Strings corrode and go dull with use and should be replaced when they lose brightness or start to hold tuning poorly. Changes in temperature and humidity can move the neck slightly, so a technician periodically adjusts the truss rod, a metal bar in the neck, and the string height. This process, called a setup, keeps the guitar comfortable and in tune up the neck.

The electronics need gentle treatment as well. Crackling controls can often be cleaned, but repairs to pickups and wiring are best left to a qualified technician, particularly for valve amplifiers, which hold dangerous voltages even when switched off. A guitar should be stored in a case or on a stand away from heat, and cables should be wound loosely to avoid breaks.

Notes from the archive

• The Frying Pan of 1934 in Vienna is described as having a neck and body cast in a single piece of aluminium.
• American patent examiners questioned whether the Frying Pan counted as a musical instrument at all, and the patent took three years to be granted.
• A 2018–19 exhibition at the Musical Instrument Museum in Phoenix presented more than eighty rare electric guitars and amplifiers from the 1930s and 1940s onward.
• Les Paul was inducted into the Rock and Roll Hall of Fame in 1988, and Leo Fender in 1992.

Terms used in this entry

archtop

A hollow guitar with an arched top and f-shaped sound holes, developed for loud acoustic playing and later electrified.

feedback

A loop in which sound from the amplifier re-excites the strings, causing a sustained, often rising tone.

humbucker

A pickup made of two coils wired to cancel electrical hum, giving a thicker tone than a single coil.

lap steel

An electric guitar played flat across the knees, with a metal bar sliding along the strings.

pickup

A magnet-and-coil device beneath the strings that converts string vibration into an electrical signal.

single-coil pickup

A pickup with one coil, known for a bright, clear sound and some susceptibility to hum.

solid body

A guitar body made from solid wood rather than a hollow shell, which resists feedback.

tremolo arm

A lever on the bridge that changes string tension briefly to bend pitch or add vibrato.

truss rod

An adjustable metal rod inside the neck that counteracts string tension and lets the neck be straightened.

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References

1. Google Arts & Culture (Technisches Museum Wien). Rickenbacher A-22 Frying Pan - Rickenbacher, Adolph — Google Arts & Culture. artsandculture.google.com/asset/rickenbacher-a-22-frying-pan/iAG0pt2PI1UBpg
2. Musical Instrument Museum (MIM), Phoenix. From Earliest Imagination to Musical Revolution, the Story of the Electric Guitar Comes to Life at MIM | Musical Instrument Museum. mim.org/from-earliest-imagination-to-musical-revolution-the-story-of-the-electric-guitar-comes-to-life-at-mim
3. Rock & Roll Hall of Fame. Les Paul | Rock & Roll Hall of Fame. rockhall.com/inductees/les-paul
4. Rock & Roll Hall of Fame. Leo Fender | Rock & Roll Hall of Fame. rockhall.com/inductees/leo-fender

Sources were consulted for facts and context; the text is original. See Sources and Methodology.