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Nine-string guitar
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A nine-string guitar is a guitar with nine strings instead of the commonly used six strings. Such guitars are not as common as the six-string variety, but are used by guitarists to modify the sound or expand the range of their instrument.

Variants

[edit]

There are two common variations of the nine string guitar:

Coursed strings

[edit]

The first style is often employed with three pairs of coursed strings similar to a twelve-string guitar. Often the three wound strings are single and the three thin strings are doubled to six strings. This allows dry power chords on the lower three and a more atmospheric chorus sound when all strings are played. Some examples of this type of nine-string guitar are the Vox Mark IX and the Vox Phantom IX[citation needed].

A different and rarer version of coursing uses doubled courses on the three bass strings, and leaves the high strings single. This facilitates free bending during solos, and slide playing[citation needed]. Mick Abrahams of the band Jethro Tull used this configuration (in open tuning) on the This Was album, though he achieved it by removing three of the top strings from an EKO 12-string acoustic-electric guitar, since stock nine-string guitars didn't exist at the time (1969). Some twenty years later, former Rollins Band guitarist Chris Haskett had a custom Paul Reed Smith nine-string guitar made in this configuration. The inspiration for the design was supposedly the desire to capture the prominent tonalities of a 6/12 doubleneck on a single-neck guitar.[citation needed]

Extended range

[edit]

The second style expands on the seven- and eight-string guitar concept by adding either an additional lower- or higher-tuned string. When a lower string is added, the standard tuning becomes C#, F#, B, E, A, D, G, B, E. The scale is often lengthened, e.g., on the Ibanez RG9 (712 mm/28" instead of the common 25.5").[1] Tuning the highest string to an A4 or higher can be accomplished with a shorter scale length and/or a thinner string such as a .008 or .007[citation needed].

Extended range nine-string guitars also sometimes have a multi-scale fingerboard design where the bass strings will be longer than the treble strings, which helps with proper intonation of the lower strings, improves string tension balance across the strings, improves harmonic overtones, overtone series, and inharmonicity[citation needed].

Notable nine-string guitarists

[edit]

Notable guitar players of double-stringed nine-string guitars:

  • Mississippi blues singer and guitarist Big Joe Williams spent most of his career playing nine-string guitars he had adapted himself from six-string instruments, with the first and second strings doubled in unison and the fourth doubled in octaves.[2] His grave marker reads "King of the Nine-String guitar".[3]
  • Guitarist Matt Pike of Sleep and High on Fire also plays several First Act nine-string guitars. Nick Sadler, of the band Daughters, also played First Act nine-string guitars.[citation needed]
  • Julian Cope played nine-string rhythm guitar during the 1980s, employing a standard twelve-string electric guitar but removing the doubled string on the bottom three courses.

Notable guitar players of extended-range nine-string guitars:

See also

[edit]

Notes and references

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Nine-string guitar

View on Grokipedia
from Grokipedia
A nine-string guitar is a stringed variant of the guitar featuring nine strings rather than the standard six, typically extending the pitch range downward by adding three bass strings tuned to C♯, F♯, and B below the conventional low E string, enabling deeper tonal possibilities in genres like heavy metal and . Modern electric models, such as the RG9 or Schecter C-9, often employ a 28-inch scale length, multi-piece necks for stability, and active pickups to handle the increased string tension and low-end clarity. Nine-string guitars have a history dating back to the 17th century Baroque guitar and later experimental designs, evolving into contemporary extended-range electrics prominent since the . In modern music, these instruments are tailored for , with manufacturers like ESP collaborating on models for bands such as to achieve "impossibly heavy" riffs and intricate layering. Musicians including High on Fire's , who commissioned a custom nine-string from in the early 2000s for its massive low-end heft in , and , who popularized the format by convincing composer to purchase a nine-string for orchestral-electric hybrids, have showcased its versatility beyond traditional tuning constraints. These instruments continue to evolve, supporting drop tunings and hybrid setups that bridge guitar and bass timbres in modern compositions.

History

Early origins

The concept of the nine-string guitar has roots in the , when the emerged in as a smaller, alto-sized instrument with a five-course configuration totaling nine strings—four doubled courses and one single high "" string—tuned roughly an above the modern guitar but without the lowest E, primarily used for strummed in courtly and folk settings. By the late 18th and 19th centuries, experimental designs like the French lyre guitar incorporated nine single strings, including wound bass strings, as seen in instruments built by luthiers such as Bazelaire and around 1781, blending classical aesthetics with expanded sonority. In the early , within the context of American blues music, a distinct variant of the nine-string guitar developed through modifications to standard six-string acoustic guitars. Its pioneering use is attributed to Delta blues musician Big Joe Williams in the 1930s. Williams, born in 1903 in , added three extra tuning pegs—often crudely attached to the —and corresponding strings to produce a fuller, more resonant sound suitable for his raw, itinerant performances in juke joints and street corners. Williams' instrument featured a coursed arrangement of nine strings, primarily doubling select courses in an open G tuning from low to high: D-G-DD-G-BB-DD, which enhanced harmonic density and provided bass extension without requiring a separate bass instrument. This setup allowed for greater tonal power to support his gravelly vocals and complex fingerpicking style in Delta blues, creating a distinctive "big" sound that mimicked ensemble textures on a solo guitar. He prominently used this configuration in his seminal 1935 Bluebird Records session, including the track "Baby Please Don't Go," marking one of the earliest recorded instances of this modern nine-string setup. The motivations behind Williams' innovation stemmed from the practical needs of solo blues performers during the Great Depression era, where achieving richer harmonics and lower-end depth was essential for captivating audiences without additional musicians. By the mid-20th century, these acoustic modifications in blues laid the foundation for the nine-string guitar's evolution into electric variants in the 1960s.

Modern developments

In the 1930s, innovators like Mario Maccaferri developed unique nine-string models with double soundboards and cutaway bodies, which young classical guitarist played in performances during the 1940s before trading it away. The modern era of the nine-string guitar began with early rock experimentation in the late 1960s, exemplified by ' use of a nine-string on Jethro Tull's debut album in 1969, which highlighted the instrument's potential for expanded tonal range in blues-rock contexts. This configuration, achieved by modifying a 12-string guitar through the removal of three upper strings and tuning it to open G, allowed for richer harmonics while maintaining playability for lead work. By the 1980s, a surge in custom electric nine-string guitars emerged among luthiers catering to heavy metal and , driven by the need for lower tunings and aggressive tones. Chris Haskett, guitarist for the from 1986 onward, commissioned custom nine-string instruments that incorporated active electronics, such as preamps and high-output pickups, to achieve the band's signature distorted metal sounds with enhanced clarity and sustain. These builds often featured extended scale lengths and reinforced to handle the tension of heavy-gauge strings in drop tunings, paving the way for broader adoption in extreme genres. The saw increased commercialization of nine-string guitars, with releasing the RG9 model in 2014 as a production electric designed for modern metal players. Featuring a 28-inch scale length, the RG9 improved intonation and tension balance for drop tunings like C# standard, making low-string definition more accessible without custom modifications. This model represented a shift toward mass-produced options with ergonomic features, such as a slim Wizard neck profile, appealing to shredders and enthusiasts. Post-2020 developments have accelerated the instrument's integration into , facilitated by advancements in (DSP) modeling amplifiers like the Line 6 Helix, which provide precise EQ and modeling for low-string clarity and reduced muddiness in complex mixes. Brands like Strandberg have responded with custom nine-string builds, often incorporating headless designs, multi-scale fretboards spanning 25.5 to 28 inches, and carbon fiber reinforcements for stability in ultra-low tunings, as seen in their Boden series custom orders tailored for high-gain . These innovations have made nine-string guitars more viable for live and studio use in genres demanding extended range without compromising speed or articulation.

Design and construction

String arrangements

Nine-string guitars typically employ nine individual strings arranged in a single course configuration, extending the range beyond standard six-string instruments by adding lower bass strings or higher treble strings. In coursed variants, which draw from twelve-string designs, three pairs of doubles are often incorporated—commonly on the three highest or lowest strings—to increase volume and create a fuller, more resonant tone without altering the fundamental pitch layout. String materials and gauges are selected to balance tension, playability, and tonal output, with variations based on the instrument's scale length, which influences overall string pull. For electric nine-string guitars, nickel-plated steel is the predominant material for wound strings, providing compatibility with magnetic pickups and a bright, sustained tone; plain steel is used for the unwound higher strings. Recommended gauges include .009 to .011 for the high E string to ensure easy bending and clarity, while the lowest strings—often tuned to B or C#—require heavier .074 to .110 caliber nickel-wound constructions for stable tension and low-end definition, as seen in sets like La Bella's HRS-90 (.009, .012, .015, .022w, .030, .040, .054, .074, .090) or Ernie Ball's 9-String Slinky (.009-.105). Attachment methods prioritize secure anchoring and intonation preservation. Electric models frequently use through-body string designs at the bridge, where strings pass directly into the body for enhanced sustain and downward pressure on the saddles, as in Hipshot's 9-string fixed bridges with saddles. Adapted standard bridge saddles accommodate the extra strings, often with widened spacing to prevent . In acoustic nine-string guitars, such as those from Furch, primary strings attach via traditional bridge pins, while additional strings route through dedicated channels to the bridge for balanced projection and reduced setup complexity. Acoustic nine-string setups favor lighter overall gauges—typically or 80/20 wound strings—for improved playability and finger comfort on the extended neck, avoiding excessive tension that could strain the top; dedicated nine-string sets are uncommon and often custom-made. Electric configurations, by contrast, employ heavier nickel-wound gauges to drive high-gain amplification, delivering greater output and attack suitable for modern genres.

Structural modifications

To accommodate the additional strings of a nine-string guitar, manufacturers implement significant neck extensions, including wider nuts typically measuring between 2.44 and 2.5 inches to ensure sufficient string spacing and reduce hand strain during play. For instance, the RG9PB model features a Wizard-9 five-piece / neck with a 62 mm (2.44-inch) nut width, providing ergonomic access to the extended string array. Similarly, the Schecter C-9 employs a three-piece neck with carbon fiber reinforcement rods and a 2.5-inch (63.5 mm) nut width, enhancing stability under the increased string tension. These guitars also incorporate 24 to 27 frets, extending the fretboard length for greater range without excessive overall neck size; the RG9PB and Schecter C-9 both utilize 24 extra-jumbo frets for precise intonation across the low and high registers. Scale length variations are crucial for maintaining consistent tension, particularly on the added lower strings, and nine-string designs commonly range from 25.5 to 28 inches to prevent slackness and ensure clear tone. The RG9PB adopts a 28-inch (712 mm) scale length, which supports downtuned configurations while preserving playability similar to standard guitars. Likewise, the Schecter Hellraiser C-9 uses a 28-inch (711 mm) scale, allowing the lowest strings to achieve firm response without excessive gauge thickness. In multi-scale configurations, fanned frets further optimize this by assigning progressively longer scales to lower strings—such as the 30-inch to 28-inch spread in the Halo Guitars Octavia—resulting in uniform tension and improved intonation across all nine strings. Body adaptations focus on reinforcement to handle the mechanical demands of nine strings, including strengthened headstocks to mount additional tuners without compromising structural integrity. Staggered-height tuners, like Gotoh models with varying post heights (e.g., 18.5 for higher strings tapering downward), are frequently used to maintain optimal string break angles over the nut, reducing tuning instability in extended-range setups. The Schecter C-9 integrates locking tuners into its reinforced construction for enhanced tuning retention under high tension. Pickup configurations are modified to deliver balanced output from the extended string complement, often featuring humbuckers or single-coils positioned to capture the low-end response effectively. In the RG9PB, dual Fishman Fluence Modern active humbuckers—one in the neck and one in the bridge—provide even tonal coverage for the nine strings, with coil-tap options for versatility. The Schecter Hellraiser C-9 employs a pair of EMG 909 active humbuckers, strategically placed to amplify the lowest strings without muddiness, ensuring clarity in high-gain applications.

Variants

Coursed configurations

Coursed configurations on nine-string guitars involve grouping strings into three courses—pairs tuned in or —alongside three single strings, resulting in a total of nine strings that emulate the doubled-string design of a 12-string guitar but with reduced overall tension for improved playability. This setup typically places the single strings on the lower register (such as E, A, and D) and the paired courses on the higher register (G, B, and E), where the tuning adds harmonic depth without overwhelming the instrument's balance. A prominent example from the 1960s is the Vox Mark IX, a produced in during Vox's collaboration with Eko, featuring a teardrop-shaped body, three single-coil pickups, and the coursed arrangement for producing "startling new sounds" through its hybrid single-and-paired string layout. In acoustic contexts, blues musician Big Joe Williams famously employed a modified nine-string guitar, a big flat-top acoustic with extra pegs and a drilled bridge to accommodate doubled 1st, 2nd, and 4th strings in (d-g-d-d-g-b-b-d-d), often capoed at the first or second fret to enhance its forceful projection alongside his vocal style. Modern reissues, such as the Phantom IX by Phantom Guitar Works, continue this tradition with an electric teardrop form and octave pairs for tonal versatility. The acoustic benefits of coursed configurations include enhanced and a natural chorusing effect from the closely spaced pairs vibrating together, which enriches harmonics and provides a fuller sound in unamplified settings without the excessive volume of a full 12-string guitar. This setup is particularly advantageous for folk and applications, where the added overtones support dynamic playing styles, as demonstrated in Williams' recordings that capture a powerful, whisper-to-shout range. However, these configurations present drawbacks, such as increased string spacing in the coursed sections that complicates left-hand muting and precise fretting, especially during rapid passages or bends, a challenge noted in modifications of vintage acoustics like Williams' setup. Common in folk-blues rebuilds, such as adapting Harmony Stella 12-strings by removing three strings to create nine, these instruments prioritize tonal richness over ease of technique. In contrast to single-string extended models, coursed nine-strings focus on layered harmonics rather than pitch extension.

Extended-range configurations

Extended-range configurations of nine-string guitars typically feature eight standard single strings extended by one additional low bass string, such as a low B or C# below the standard low E, to expand the instrument's pitch range downward while maintaining compatibility with conventional guitar playing. This setup is predominantly found in electric solid-body designs, allowing musicians to access sub-bass frequencies without significantly altering familiar fingerings on the upper strings. A prominent example is the RG9, introduced in 2014, which employs a 28-inch scale length. Custom models from ESP, such as those designed for guitarist and debuted in 2020, also exemplify this approach with tailored low-string additions and high-output pickups to handle extreme low-end response. These instruments integrate seamlessly with standard six-string techniques, enabling players to incorporate sub-bass elements into genres like and metal for enhanced rhythmic depth and harmonic complexity. Recent models as of 2025, including the Legator N9F and Agile Chiral Nirvana, continue to advance extended-range designs with features like frets and headless configurations. Engineering these guitars requires a scale length of at least 26.8 inches—often 28 inches or more—to ensure the low extension string maintains tension and intonation without excessive detuning in the sub-bass register. Many models incorporate locking systems or fixed bridges to stabilize tuning across the extended range, distinguishing this single-string expansion from coursed pairings that prioritize tonal density over pitch breadth.

Tunings

Standard extended tunings

The standard extended tuning for nine-string guitars adds a low C♯ string below the conventional six-string configuration, resulting in the pitch sequence C♯–F♯–B–E–A–D–G–B–E from lowest to highest. This arrangement preserves the fourths and thirds of the traditional E–A–D–G–B–E intervals across the upper seven strings while introducing sub-bass extension for deeper tonal range. The tuning is particularly suited to modern metal genres, where it enables drop-heavy riffs without requiring extensive relearning of chord shapes or scales; for instance, Deftones guitarist Stephen Carpenter employs it on his custom ESP nine-string models to achieve the band's signature low-end aggression, as featured on their 2020 album Ohms. A variant of this extended tuning further lowers the overall pitch by a whole step, yielding B–E–A–D–G–B–E–A–D, which extends the range at both the bass and treble ends for greater versatility in complex arrangements. This configuration gained popularity in circles after 2010, allowing bands to explore intricate polyrhythms and harmonic depth while maintaining playable tension on standard-scale instruments. The rationale for these tunings lies in their compatibility with familiar six-string techniques, such as voicings, which translate directly to the added strings for seamless integration of sub-bass elements without altering hand positions significantly. Achieving balanced playability requires careful gauging, as the low C♯ ( approximately 34.65 Hz) demands thicker diameters to avoid excessive slack. String tension can be calculated using the T=UW×(2×L×F)2386.4T = \frac{UW \times (2 \times L \times F)^2}{386.4}, where TT is tension in pounds, UWUW is unit weight in pounds per inch, LL is scale length in inches, and FF is in Hz; for a typical 28-inch scale, this implies a low C♯ gauge of .110 or heavier to attain 15–20 pounds of tension for optimal feel and intonation.

Open and alternate tunings

Open and alternate tunings on the nine-string guitar deviate from linear standard configurations, allowing for richer resonance, drone effects, and genre-specific voicings that leverage the instrument's extended range. These tunings often emphasize open chords, modal structures, or partial coursing to facilitate slide work, riffing, and atmospheric playing, particularly in , folk-rock, and heavy genres. Unlike standard extended tunings that maintain intervals across strings, open and alternate setups prioritize consonant open-string harmonies for creative expression. A prominent example of an open tuning adapted for a coursed nine-string guitar is the open G variant used by blues musician Big Joe Williams, tuned low to high as D-G-D-D-G-B-B-D-D. This configuration doubles select strings (the middle D, G, and high D courses) to create a fuller, resonant sound ideal for drone-based blues and slide guitar techniques, where the open strings form a G major chord emphasizing rhythmic drive and sustained tones. Williams employed this setup on his modified acoustic guitar, often with a capo at the first or second fret to shift the key while preserving the open G structure for expressive, percussive playing in Delta blues traditions. In the realm of folk-rock, guitarist of Jethro Tull utilized an open tuning on a modified 12-string adapted to nine strings by removing the three highest strings, resulting in doubled low courses for the E, A, and D strings while leaving the G, B, and high E single. This setup, featured on the 1968 album , provided a chiming, layered texture suited to the band's blues-infused progressive sound, enabling Abrahams to blend open chord strums with lead lines in tracks like "Singing All Day." The adaptation highlighted the nine-string's potential for folk-rock by combining 12-string chorusing with simplified stringing for easier playability and tonal focus. For heavier genres like metal and , alternate tunings such as modal D variants extend drop A configurations to exploit low-end growl and atmospheric riffing. This setup facilitates heavy, palm-muted riffs with open- resonances, as seen in bands pushing extended-range guitars for downtuned, riff-centric compositions. Retuning a nine-string guitar to open or alternate setups requires careful adjustments to maintain intonation and prevent fret buzz, especially on multi-scale fretboards where tension varies. Players often use a capo to the entire tuning without restringing, or opt for custom sets with balanced gauges (e.g., lighter highs and heavier lows) to equalize tension and avoid buzzing on fanned frets during down-tuning.

Playing techniques

Adaptations for extended range

Players transitioning from six- or seven-string guitars to nine-string models must adapt to the wider fretboard, which typically spans 2.44 to 2.5 inches (62 to 63.5 mm) at the nut compared to 1.6875 inches on standard models, requiring greater hand span and finger strength for effective navigation. The increased string spacing necessitates thumb-over techniques for barring the low strings, where the thumb wraps around the neck to fret the lowest string (often tuned to C#) while the index finger bars across, facilitating access to the extended bass range without excessive stretching. Practicing scales starting from the low C#—such as the C# minor scale in positions 1 through 5—builds familiarity with the layout and improves left-hand positioning across the full nine strings. Picking adaptations involve extending patterns to hybrid sweeps, combining the pick for downstrokes on lower strings with middle and ring fingers plucking upward on higher strings, allowing efficient coverage of all nine strings while minimizing right-hand fatigue during fast passages. This technique is particularly useful for arpeggios and runs that span the extended range, as it distributes the workload between pick and fingers for smoother execution. Amplification adjustments are essential to achieve low-end clarity on nine-string guitars, where the additional bass strings can introduce muddiness in mixes; a common approach is to apply EQ boosts of +3 to +5 dB around 80-100 Hz to enhance the fundamental frequencies of the low C# and F# strings, paired with cuts of -3 dB in the 250-500 Hz range to reduce boxiness and improve definition. These settings help the extended low range cut through without overwhelming the overall tone, especially in dense arrangements. Common pitfalls for new nine-string players include over-reliance on the upper six strings, resulting in unbalanced solos that neglect the instrument's full potential and lead to thin-sounding leads; to counter this, dedicated exercises focusing on full-range arpeggios—such as sweeping diminished arpeggios from the low C# up through the high e—promote even utilization of all strings and develop a more integrated playing style.

Specialized methods

Two-hand tapping on the nine-string guitar builds upon Eddie Van Halen's pioneering technique by spanning the instrument's full range, enabling intricate patterns that incorporate ostinatos on the lowest strings for rhythmic drive while executing melodic lines higher up. This approach allows players to create piano-like , with the fretting hand tapping notes on multiple strings simultaneously and the picking hand providing accents or additional taps. Guitarist of exemplifies this method, adapting his fingerstyle —typically on eight-string guitars—to the nine-string configuration, where the added low string (often tuned to C#) supports sustained bass ostinatos beneath cascading tapped harmonies. In blues contexts, slide and bottleneck techniques on coursed nine-string guitars exploit the doubled strings for enhanced , particularly in open tunings that facilitate smooth glissandi across paired courses. The doubled low strings amplify the slide's sustain and volume, producing a fuller, more powerful tone suited to raw, emotive expression. Pioneering artist Big Joe Williams modified a flat-top into a nine-string instrument with doubled courses and tuning to open G (d-g-d-d-g-b-b-d-d, low to high), often with a capo at the first or second ; he employed a bottleneck slide exclusively in this setup to achieve resonant, ringing glissandi that complemented his forceful vocals and amplified the guitar's natural power without relying on heavy effects. Harmonic chording on the nine-string guitar leverages the extended range to execute simultaneous low-bass foundations and high-register melodies, fostering complex layered textures ideal for progressive and styles. Players form chords that emphasize natural s on lower strings while articulating melodic intervals on upper ones, often syncing with polyrhythmic structures such as 7/8 patterns overlaid against 4/4 to generate shifting accents and groove. In applications, this technique integrates palm-muted chugs on the low strings with pinches and artificial s higher up, creating a dense, rhythmic interplay that exploits the instrument's tonal breadth for polyrhythmic depth without additional instrumentation. Effects integration, particularly whammy bar dives on the nine-string's extended low strings, produces subsonic sweeps that add dramatic flair to passages, bending pitches downward to evoke rumbling, otherworldly depths. The whammy bar's leverage on heavier-gauge low strings enables controlled dives and releases, enhancing sweeps and harmonics with vibrato-like modulation. In , this method extends dive-bomb techniques to the instrument's lowest registers, allowing for seamless transitions between harmonic overtones and detuned riffs while maintaining tuning stability on floating systems adapted for extended-range necks.

Notable users

Blues and folk players

Big Joe Williams (1903–1982), a pioneering Delta blues guitarist and singer, is renowned for his innovative use of the nine-string guitar, which he customized by adding three extra strings to a standard six-string acoustic instrument to achieve a fuller, more resonant sound. He employed this setup from the mid-1930s through the 1970s, incorporating it into his raw, percussive fingerstyle playing that emphasized rhythmic drive and emotional intensity in live performances and recordings. Tracks like "Peach Orchard Mama," recorded in 1935 and later featured on compilations such as Nine String Guitar Blues, exemplify his technique, where the additional strings created droning overtones and enhanced the guitar's percussive slap and pound. In the 1980s, British musician (born 1957), known for his experimental and folk-infused work, adopted a coursed nine-string configuration on his 12-string guitar by using single courses for the lower E, A, and D strings while doubling the G, B, and high E strings. This setup contributed to the droning, psychedelic textures on his 1986 album Saint Julian, where Cope handled duties to support his neo-psychedelic compositions blending folk elements with atmospheric soundscapes. His approach highlighted the nine-string's potential for layered, hypnotic folk experimentation beyond traditional applications. These players collectively influenced acoustic extended-range guitar techniques in and folk, prioritizing fingerstyle precision and percussive dynamics over high-speed leads, thereby broadening the instrument's role in roots music traditions.

Rock and metal players

of began incorporating nine-string guitars into his setup in the late , marking a shift toward even lower tunings for the band's atmospheric, downtuned riffs. In 2018, ESP crafted his first custom nine-string model, which he debuted publicly in the music video for the title track of ' 2020 album Ohms. This ESP Custom Shop instrument, equipped with custom Fishman Fluence pickups, allowed Carpenter to explore heavier, extended-range textures central to the album's sound. Chris Haskett, guitarist for from 1986 to 1997, contributed to the punk-metal fusion of albums like Hard Volume (1989) using custom electric guitars that emphasized aggressive, high-gain tones. While his early work relied on standard configurations, Haskett later adopted custom coursed nine-string electrics, such as a 2015 PRS hybrid model derived from a 12-string Custom 22, featuring doubled wound strings for added depth and single high strings for soloing clarity. This setup blended the tonal weight of a double-neck guitar with single-neck playability, influencing his post- explorations in and . Tosin Abasi of transitioned to nine-string guitars around 2015, building on his earlier use of extended-range instruments for . His adoption of multi-scale, fanned-fret designs through and later his Abasi Concepts brand facilitated intricate tapping and techniques showcased in the band's evolving sound. Although The Joy of Motion (2014) primarily featured eight-string models, Abasi's subsequent work, including live performances and recordings, highlighted the nine-string's role in achieving polyrhythmic complexity and fluid extended-range phrasing. Matt Pike, frontman of the stoner doom bands and , draws from folk and roots in his riff-heavy style and began incorporating nine-string guitars into his playing in the early to expand tonal depth in heavy contexts. While primarily electric, Pike's use of extended-range instruments echoes acoustic traditions through unplugged explorations in his solo acoustic sets, where he adapts doom structures to fingerpicked arrangements emphasizing raw, roots-oriented narratives. Guthrie Govan, a and fusion guitarist known for his work with and as a signature artist, has popularized the nine-string guitar in modern contexts. In the , he incorporated extended-range models into his versatile playing style, including gifting a custom nine-string to composer for use in orchestral-electric hybrid scores as of 2019. In the , Japanese band collaborated with ESP on custom nine-string guitars to achieve "impossibly heavy" riffs and intricate layering in their sound. These instruments supported the band's high-energy performances and recordings, extending the format's reach in global metal scenes. In the 2020s, nine-string guitars have gained prominence in the and scenes, inspiring broader adoption among acts seeking enhanced rhythmic density and tonal extension through low tunings.

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  33. https://legatorguitars.com/products/n9f
  34. https://www.rondomusic.com/9.String.Guitars.html
  35. https://shredecon.wordpress.com/2015/10/17/buying-and-living-with-a-9-string-guitar-review-of-the-ibanez-rg9/
  36. https://www.reddit.com/r/ExtendedRangeGuitars/comments/10n9589/need_some_help_deciding_on_the_new_28_inch_scale/
  37. https://www.thegearpage.net/board/index.php?threads/i-got-a-9-string-call-me-crazy-but-let-me-explain.2269959/
  38. https://www.liutaiomottola.com/formulae/tension.htm
  39. https://sevenstring.org/threads/show-me-your-9-string-tunings-2017-edition.322594/
  40. https://www.seymourduncan.com/blog/the-players-room/the-ultimate-prog-metal-rhythm-tuning
  41. https://www.daddario.com/globalassets/pdfs/accessories/tension_chart_13934.pdf
  42. https://www.tullianos.com/tullguitarpage/songs/Moveonalone.htm
  43. https://www.haloguitars.com/store/what-causes-fret-buzz-and-how-to-fix-it
  44. https://www.guitarcenter.com/Ibanez/RG-Series-RG9-9-string-Electric-Guitar-Black-1394464455777.gc
  45. https://www.guitarcenter.com/Schecter-Guitar-Research/Hellraiser-C-9-Electric-Guitar-Black-Cherry-1396278323745.gc
  46. https://fretterverse.com/9-string-guitar-tuning-guide/
  47. https://someradguitarist.wordpress.com/tag/scales-for-9-string-guitar/
  48. https://www.premierguitar.com/lessons/fretboard-workshop-roll-the-bones
  49. https://www.premierguitar.com/lessons/country/hybrid-picking-guitar-lesson
  50. https://www.gearnews.com/guitar-picking-techniques-explained-hybrid-sweep-and-more/
  51. https://neuraldsp.com/articles/electric-guitar-eq-guide
  52. https://www.nailthemix.com/how-to-mix-low-tuned-guitars
  53. https://www.premierguitar.com/lessons/digging-deeper-a-new-way-to-practice-scales
  54. https://metalinjection.net/av/tosin-abasi-has-a-9-string-guitar-now-and-he-knows-how-to-use-it
  55. https://www.ultimate-guitar.com/news/general_music_news/tosin_abasi_is_now_using_a_9-string_guitar_watch_him_play.html
  56. https://acousticguitarvideos.com/4933/big-joe-williams-9-string-blues/
  57. https://www.riffhard.com/how-to-djent-on-a-guitar/
  58. https://themystickeys.com/whammy-bar-how-to-use-like-a-pro/
  59. https://www.discogs.com/release/3556209-Big-Joe-Williams-Nine-Strings-Guitar-Blues
  60. https://equipboard.com/pros/julian-cope
  61. https://eightiesrarevideos.blogspot.com/2012/11/julian-cope-world-shut-your-mouth.html
  62. https://www.espguitars.com/articles/2014122-new-deftones-album-ohms-announced-check-out-the-first-song
  63. https://www.guitarworld.com/gear/chris-hasketts-prs-custom-nine-string-guitar-video
  64. https://www.musicradar.com/news/guitars/unique-prs-9-string-revealed-and-demoed-616860
  65. https://www.discogs.com/release/567789-Rollins-Band-Hard-Volume
  66. https://abasiconcepts.com/
  67. https://www.woodriteguitars.com/products/matt-pike-signature-warlord-imperial-9
  68. https://metalinjection.net/news/is-meshuggah-using-9-string-guitars-now
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