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When the twang of a slapback echo dances through a smoky room and the upright bass kicks in, you know you’re in the heart of rockabilly. It’s a genre that rides on attitude, energy, and—above all—a distinct sonic identity. At the center of that sound? The hollow body electric guitar. More than just a style statement, these instruments are sonic engines built to deliver the bright, punchy, and articulate tones that defined an era and continue to inspire modern roots-rock revivalists.
As we move into 2026, the landscape of hollow body electric guitars has evolved—blending vintage craftsmanship with modern playability and reliability. Whether you’re chasing the raw edge of Gene Vincent, the slick licks of Brian Setzer, or the refined resonance of modern psychobilly, your guitar choice is pivotal. But how do you navigate the sea of semi-hollows, full hollows, and thinline designs to find the perfect match for that authentic rockabilly tone? This guide dives deep into the anatomy of tone, construction nuances, and the key features that define a great rockabilly guitar—so you can make an informed decision without chasing fads.
Top 10 Hollow Body Guitars
Detailed Product Reviews
1. IYV-IJZ-300A TSB Jazz Solid hollow-Body Electric Guitar, Tobacco Sunburst
Overview:
The IYV-IJZ-300A TSB Jazz Electric Guitar blends vintage aesthetics with modern manufacturing precision. Designed as a solid hollow-body instrument, it targets jazz and blues players seeking warm, articulate tones with minimal feedback. Built using CNC machining and computer programming, it promises consistency in construction.
What Makes It Stand Out:
Its standout feature is the precision engineering—every component is crafted with minimal defectiveness, ensuring a reliable neck and consistent build quality. The tobacco sunburst finish adds classic appeal, while the solid hollow-body design enhances resonance without compromising structural integrity.
Value for Money:
Priced competitively, this guitar offers solid specifications for beginners and intermediate players. While it lacks premium tonewoods or hand-crafted detailing, its CNC-based production ensures affordability without sacrificing baseline quality.
Strengths and Weaknesses:
Strengths: Consistent manufacturing, smooth neck profile, authentic jazz tones, attractive finish.
Weaknesses: Limited hardware details, unspecified pickups, and lack of brand reputation may deter serious players.
Bottom Line:
A dependable entry-level option for jazz enthusiasts who value precision-built instruments at an accessible price point.
2. Grote Full Scale Electric Guitar Semi-Hollow Body Guitar Stainless Steel Frets (Vintage Sunburst)
Overview:
The Grote Semi-Hollow Electric Guitar in Vintage Sunburst is a stylish, performance-ready instrument tailored for players seeking rich, warm tones. With a 24.75-inch scale length and semi-hollow Canadian maple body, it’s ideal for jazz, blues, and rock genres.
What Makes It Stand Out:
Its semi-hollow maple body delivers resonant depth, while stainless steel frets ensure durability and smooth playability. The maple neck paired with a black wood fingerboard offers a balanced, fast feel, and the metallic truss rod cover adds a touch of elegance.
Value for Money:
Positioned as a mid-tier guitar, it provides high-end features like stainless steel frets and solid wood construction at a reasonable price, outperforming many competitors in its class.
Strengths and Weaknesses:
Strengths: Excellent resonance, durable frets, smooth neck, vintage aesthetic.
Weaknesses: Black wood fingerboard is less common and may not suit all tonal preferences; limited hardware specs disclosed.
Bottom Line:
A well-crafted, resonant semi-hollow guitar that delivers professional-level features for discerning amateur and gigging musicians.
3. Grote Full Scale Electric Guitar Semi-Hollow Body Guitar Stainless Steel Frets(Red)
Overview:
The red variant of the Grote Semi-Hollow Electric Guitar combines bold aesthetics with solid performance. It shares the same core specs as its vintage sunburst sibling but stands out with a vibrant finish that appeals to stage performers and style-conscious players.
What Makes It Stand Out:
Featuring a semi-hollow basswood body, this guitar offers a lighter weight and warm, balanced tone. The 24.75-inch scale, maple neck, and stainless steel frets ensure excellent playability, while the red finish commands attention under stage lights.
Value for Money:
Offering identical craftsmanship to higher-priced models, this guitar delivers exceptional value. The use of basswood keeps costs down without significantly compromising tone or durability.
Strengths and Weaknesses:
Strengths: Lightweight body, eye-catching design, stainless steel frets, versatile sound.
Weaknesses: Basswood is less dense than maple, potentially affecting sustain; finish may not appeal to traditionalists.
Bottom Line:
A vibrant, well-built semi-hollow guitar that balances affordability, style, and sonic versatility—ideal for gigging musicians and recording artists.
4. Redid Semi-Hollow Body Electric Guitar RD-100 Jazz Guitar with F-Hole,Maple neck,humbucker Pickups(Brown)
Overview:
The Redid RD-100 Semi-Hollow Electric Guitar in brown offers a classic 335-style design with modern enhancements. Built for jazz, blues, and rock, it features a maple neck, rosewood fretboard, and humbucker pickups for rich, warm tones.
What Makes It Stand Out:
The combination of a Canadian hard maple neck and rosewood fretboard ensures durability and a smooth playing experience. Stainless steel frets enhance longevity, while the 3-way toggle and dual volume/tone controls offer extensive tonal shaping.
Value for Money:
At its price point, the RD-100 delivers premium materials and versatile electronics typically found in more expensive models, making it a strong contender in the mid-range market.
Strengths and Weaknesses:
Strengths: High-quality woods, excellent intonation, flexible controls, professional-grade build.
Weaknesses: Heavier than some semi-hollows; brown finish may show wear over time.
Bottom Line:
A superbly crafted, tonally versatile semi-hollow guitar that offers outstanding value for intermediate to advanced players.
5. Redid Semi-Hollow Body Electric Guitar RD-100 Jazz Guitar with F-Hole,Maple neck,humbucker Pickups(Orange)
Overview:
The orange-finished Redid RD-100 Semi-Hollow Guitar mirrors the brown version in specs but turns heads with its vibrant hue. Designed for jazz and beyond, it features a maple neck, rosewood fretboard, and dual humbuckers for dynamic sound.
What Makes It Stand Out:
Beyond its striking orange finish, the guitar boasts a 335-style semi-hollow body, stainless steel frets, and a full suite of tone controls. The Canadian hard maple neck ensures stability and smooth playability across all frets.
Value for Money:
This model offers the same high-end features as its brown counterpart at no additional cost, making the orange version a stylish yet practical choice without premium pricing.
Strengths and Weaknesses:
Strengths: Eye-catching appearance, premium materials, excellent tonal range, durable construction.
Weaknesses: Bright finish may not suit all tastes; potential for finish chipping on edges with heavy use.
Bottom Line:
An expressive, high-performance semi-hollow guitar that blends standout aesthetics with professional-grade functionality—perfect for players who want to sound and look exceptional.
6. Grote Full Scale Electric Guitar Semi-Hollow Body Guitar Stainless Steel Frets (Natural)
Overview:
The Grote Full Scale Electric Guitar is a refined semi-hollow body instrument designed for players seeking tonal richness and expressive playability. Built with a Canadian Maple semi-hollow body and a 24.75-inch scale length, it delivers warm, resonant tones ideal for jazz, blues, and rock genres.
What Makes It Stand Out:
Its standout features include stainless steel frets for long-lasting performance and smooth bending, paired with a Maple neck and Black Wood fingerboard that ensure fluid playing across all 22 frets. The metallic truss rod cover adds a touch of visual elegance while reinforcing structural integrity.
Value for Money:
Positioned as a mid-tier instrument, the Grote guitar offers premium materials typically found in higher-end models. The attention to tonewood quality and fretwork makes it a strong contender for discerning players on a budget.
Strengths and Weaknesses:
Strengths: Rich resonance from semi-hollow maple body, excellent fret durability, comfortable neck profile. Weaknesses: Limited hardware details provided, and lack of pickup specifications may deter tone-focused buyers.
Bottom Line:
A well-crafted, sonically versatile semi-hollow guitar that balances tradition and modern playability—ideal for intermediate players and genre-flexible musicians.
7. Redid Semi-Hollow Body Electric Guitar RD-100 Jazz Guitar with F-Hole,Maple neck,humbucker Pickups(Green)
Overview:
The Redid RD-100 is a stylish semi-hollow electric guitar tailored for jazz, blues, and rock enthusiasts. Its elegant green finish and F-hole design echo classic 1950s aesthetics while delivering modern tonal flexibility.
What Makes It Stand Out:
Featuring a Canadian hard maple neck and rosewood fretboard, the RD-100 ensures durability and a smooth playing surface. The stainless steel frets resist wear, and dual humbucker pickups with a 3-way switch and independent volume/tone controls offer extensive sonic shaping.
Value for Money:
At its price point, the RD-100 delivers high-end features like premium tonewoods and noise-canceling pickups, making it a cost-effective option for gigging musicians and home players alike.
Strengths and Weaknesses:
Strengths: Excellent build quality, versatile tone controls, durable materials. Weaknesses: Weight may be an issue for some due to semi-hollow structure; finish may show wear over time.
Bottom Line:
A reliable, great-sounding semi-hollow guitar that punches above its weight—perfect for players seeking classic tone with modern functionality.
8. Ibanez AF75GBKF AF Artcore 6 String Black Flat Hollow Body Electric Guitar
Overview:
The Ibanez AF75GBKF is part of the acclaimed Artcore series, combining elegant design with professional-grade performance. This hollow-body electric guitar features a mahogany set-in neck and a sleek black flat finish, ideal for jazz and sophisticated genres.
What Makes It Stand Out:
Its bound rosewood fretboard with acrylic block inlays offers visual flair and precise navigation. The passive Classic Elite humbuckers deliver warm, full-bodied tone, while the ART-1 bridge and VT60 tailpiece ensure tuning stability and enhanced sustain.
Value for Money:
Ibanez packs professional features into an affordable platform. The AF75GBKF competes with more expensive hollow bodies, offering excellent craftsmanship and reliable hardware.
Strengths and Weaknesses:
Strengths: Rich, warm tone; stable hardware; comfortable neck joint. Weaknesses: Limited feedback resistance at high volumes; fewer tonal options due to fixed pickup configuration.
Bottom Line:
A stylish, well-built hollow body guitar perfect for jazz players and studio performers who value tone and elegance.
9. GROTE Jazz Electric Guitar Semi-Hollow Body Trapeze Tailpiece Bridge Guitar Gig Bag (RED)
Overview:
The GROTE Jazz Electric Guitar in red is a visually striking semi-hollow instrument designed for players who value both style and sustainability. It features a basswood body with simulated maple grain and comes with a matching gig bag for portability.
What Makes It Stand Out:
Its eco-conscious design uses advanced printing to mimic natural wood grain, reducing environmental impact without sacrificing aesthetics. The maple neck and rosewood fingerboard ensure smooth playability, while the trapeze tailpiece enhances resonance.
Value for Money:
Offering a complete package with a gig bag and solid construction, this guitar is an exceptional value for beginners and intermediate players on a budget.
Strengths and Weaknesses:
Strengths: Includes gig bag, beginner-friendly design, eco-friendly finish. Weaknesses: Simulated wood may feel less premium; limited hardware details may affect upgrade potential.
Bottom Line:
A great entry-level semi-hollow guitar that combines affordability, portability, and environmental awareness—ideal for new players and casual performers.
10. Semi-Hollow Body Electric Guitar Jazz Electric Guitar with F-Hole,Maple neck,Trapeze Tailpiece Bridge Electric Guitar, Gig Bag,humbucker Pickups (GT335-02-brown)
Overview:
The GT335-02 is a classic-style semi-hollow electric guitar designed for versatility and stage-ready performance. With a maple center block and F-holes, it balances resonance and feedback control, making it ideal for jazz, blues, and rock.
What Makes It Stand Out:
Equipped with Alnico V double-coil humbuckers, it delivers a balanced frequency response—solid lows, clear mids, and bright highs. The ergonomic maple neck and rosewood fingerboard ensure comfort, while the included gig bag enhances portability.
Value for Money:
This guitar offers professional-level features at an accessible price, including vintage-inspired design, quality pickups, and protective gig bag—rare in this range.
Strengths and Weaknesses:
Strengths: Excellent tonal range, feedback-resistant design, beginner-friendly setup. Weaknesses: Finish durability may vary; hardware may need upgrading for advanced use.
Bottom Line:
A high-value, all-around performer that delivers classic tone and modern reliability—perfect for learners and gigging musicians alike.
Why Hollow Body Guitars Rule the Rockabilly Sound
Hollow body electric guitars have long been the backbone of rockabilly, and for good reason. Unlike solid bodies, their chambered construction allows the top, back, and sides to vibrate freely, producing a rich, acoustic-like resonance that cuts through with clarity. This acoustic character, when amplified, gives rockabilly its signature “live” and dynamic feel.
More importantly, hollow bodies emphasize midrange punch and natural reverb—two elements critical for that slapback-driven rhythm playing. When paired with tube amps cranked just enough to break up, they deliver a warm, snappy tone that’s both articulate and aggressive. The inherent feedback resistance (when properly braced and engineered) and tonal complexity make them ideal for both rhythm chugging and sharp, staccato lead lines.
Hollow vs. Semi-Hollow: What’s Right for Rockabilly?
While the terms are often used interchangeably, there’s a crucial difference between fully hollow and semi-hollow body guitars—and that difference directly impacts tone and performance.
Fully Hollow Body Guitars
These instruments are built like acoustic guitars with f-holes and a completely hollow interior. They offer the most acoustic resonance and natural sustain, making them ideal for players who want maximum warmth and depth. However, they can be more prone to feedback at high volumes—unless they’re designed with feedback baffles or tone bars.
For rockabilly purists, fully hollow guitars are often the top choice because they deliver that vintage “air” and openness that’s hard to replicate in a semi-hollow design.
Semi-Hollow Body Guitars
Semi-hollow guitars feature a center block running through the body, usually made of solid wood, which reduces feedback and increases sustain. They still have hollow wings, preserving much of the acoustic resonance while offering greater stability under amplification.
If you’re playing louder venues or blending rockabilly with rock or blues, a semi-hollow might be the better fit. They strike a balance between acoustic warmth and electric aggression, with improved tuning stability and resistance to howl.
The Anatomy of a Rockabilly Tone
Achieving the right tone isn’t just about the guitar—it’s about how every component interacts. Let’s break down the elements that shape that unmistakable rockabilly bark.
Body Shape and Size
The size and shape of the body influence both volume and tonal character. Larger bodies, like the classic jazzbox style, produce deeper lows and more natural reverb. However, for rockabilly, many players favor thinline or smaller-bodied designs that are more comfortable for standing and moving on stage.
Thinline hollow bodies are especially popular—they’re lightweight, feedback-resistant, and project a focused midrange that cuts through mixes without overwhelming the low end.
Wood Selection and Its Impact
Wood choice plays a massive role in shaping tone. Maple is the go-to for rockabilly guitars, prized for its bright attack, clarity, and tight low end. It enhances note definition—critical when playing rapid, syncopated rhythm patterns.
Mahogany adds warmth and depth, often used in necks or backs to balance maple’s brightness. Spruce tops, while less common, can add acoustic-like responsiveness, ideal for fingerstyle rockabilly players.
The combination of a maple top with mahogany sides and back offers a balanced, versatile tone that works across styles—something to consider if you’re blending genres.
Bridge and Tailpiece: The Unsung Tone Shapers
While pickups and wood get most of the attention, the bridge and tailpiece are silent partners in crafting rockabilly tone.
Tune-O-Matic and Stopbar Combos
This classic setup offers excellent sustain and tuning stability. The Tune-O-Matic bridge allows precise intonation adjustments, while the stopbar tailpiece anchors the strings firmly, enhancing string tension and brightness—two qualities essential for twangy rhythm work.
Trapeze and Bigsby Tailpieces
Trapeze tailpieces, often seen on Gretsch-style guitars, route strings over the top of the body, increasing downward pressure on the bridge. This boosts resonance and acoustic volume. When paired with a Bigsby vibrato, they allow for subtle pitch bends—perfect for rockabilly’s signature “dive-bomb” licks.
However, Bigsbys require careful setup. Poor installation can lead to tuning instability, a dealbreaker during live performance. Look for models with upgraded rollers or locking tuners to mitigate this.
Pickups: The Heart of the Twang
No component affects tone more than pickups. For rockabilly, you want clarity, brightness, and enough output to drive an amp into sweet breakup.
Filter’Tron-Style Pickups
Originally developed by Gretsch, Filter’Trons are synonymous with rockabilly. They’re humbuckers, but with a narrower coil and Alnico magnets, delivering a clear, chimey tone with tight bass and crisp highs. They’re less muddy than standard humbuckers and cut through with authority—perfect for clean and slightly overdriven tones.
P-90s and Their Gritty Character
P-90s are single-coil pickups with a fatter, rawer voice than traditional Strat or Tele pickups. They offer a midrange growl that’s excellent for gritty lead lines and aggressive rhythm playing. While they can hum, their dynamic response and punch make them a favorite among players who want more edge.
Full-Size Humbuckers
While less traditional, modern humbuckers with coil-splitting can work in rockabilly, especially if you’re blending genres. Just ensure they’re voiced for clarity, not just high output.
Electronics: Simple is Often Better
Rockabilly thrives on simplicity. Most vintage-inspired hollow bodies stick to straightforward control layouts: volume and tone knobs for each pickup, sometimes with a three-way switch.
More complex electronics—like phase switches or stacked tone controls—can dilute the directness that defines the genre. That said, modern touches like push-pull coil taps or treble bleed circuits can add versatility without sacrificing core tone.
Look for guitars with high-quality pots and capacitors. Cheap electronics can muddy your signal and reduce clarity—exactly what you don’t want in a genre built on precision.
Neck Profile and Playability
The neck is where feel meets function. Rockabilly guitarists often play fast, intricate runs and complex chord transitions, so playability is non-negotiable.
Neck Shape and Scale Length
C-shaped or U-shaped necks are common in vintage-style guitars and offer a comfortable grip for chording and bending. Players with larger hands might prefer a chunkier profile, while those focused on speed may lean toward a slimmer, modern carve.
Scale length also matters. Most hollow bodies use a 24.75” scale (similar to a Gibson), which offers slightly less string tension than a 25.5” Fender scale. This makes bending easier and contributes to a warmer, more rounded tone.
Fretboard Materials
Ebony and rosewood are the most common fretboard woods. Ebony is dense and bright, enhancing note definition and sustain. Rosewood is slightly warmer and offers a smoother feel, ideal for players who prioritize comfort over cut.
Hardware Quality: Don’t Overlook the Details
It’s easy to get caught up in tone and looks, but hardware quality can make or break a guitar’s performance.
Tuners and Stability
Tuning stability is essential—especially if you use a Bigsby. Look for sealed tuners with a 14:1 or 18:1 gear ratio for smooth, precise tuning. Vintage-style open-back tuners look great but may not hold up under heavy use.
Binding and Finish
Binding isn’t just cosmetic—it can affect resonance and durability. Multi-ply binding adds a vintage touch and protects the edges of the body and neck. Nitrocellulose lacquer finishes, while thinner and more fragile, allow the wood to resonate more freely than thick polyurethane coats.
Amp Pairing: Getting the Full Picture
Even the best hollow body guitar won’t sing without the right amp. Rockabilly tone is heavily shaped by tube amps with spring reverb and slapback echo.
Ideal Amp Characteristics
Look for amps with:
- Tube-driven preamps for natural breakup
- Spring reverb for that “slapback” shimmer
- Simple EQ sections (bass, treble, volume)
- 1x12 or 2x12 speaker configurations
Brands known for rockabilly-friendly amps often emphasize clean headroom with a touch of grit when pushed. The interaction between a hollow body’s natural resonance and a tube amp’s compression is where magic happens.
Effects: Less is More
While modern players use pedals, traditional rockabilly relies on amp tone and guitar volume knob manipulation. A touch of reverb or slapback echo can enhance the vibe, but avoid over-processing. The guitar’s natural dynamics should shine through.
Build Quality and Craftsmanship
In 2026, you’ll find hollow bodies ranging from mass-produced imports to hand-built boutique instruments. Build quality directly affects tone, playability, and longevity.
Attention to Detail
Check for tight seams, smooth fretwork, and consistent finish application. Loose binding, sharp fret ends, or uneven neck angles are red flags—even on high-end instruments.
Set-Neck vs. Bolt-On
Most hollow and semi-hollow guitars use set-neck construction, which improves sustain and resonance. Bolt-on necks are rare in this category but can offer easier repairs. Set necks are generally preferred for tonal integrity.
Customization and Upgradability
Even a great stock guitar can benefit from upgrades. Many players enhance their rockabilly rigs with simple mods.
Common Upgrades
- Upgrading pickups to boutique Filter’Trons or P-90s
- Installing better tuners or a roller bar on Bigsby tailpieces
- Adding a tone switch or treble bleed circuit
- Refretting with jumbo or medium-jumbo frets for smoother bends
Choose a guitar with accessible electronics and standard parts to make future upgrades easier.
Playing Style and Ergonomics
Rockabilly isn’t just about tone—it’s about performance. You’ll be standing, moving, and playing for long sets. Comfort matters.
Weight and Balance
Full hollow bodies can be heavy. Look for models with chambered designs or lightweight tonewoods to reduce fatigue. A well-balanced guitar won’t neck-dive when strapped on.
Strap Button Placement
Ensure the strap buttons are positioned for stability. Some vintage-style guitars have top-mounted buttons that can rotate under tension. Rear-mounted or side buttons often provide better balance.
Vintage vs. Modern: Bridging the Gap
There’s undeniable charm in vintage instruments, but modern guitars offer significant advantages.
Vintage Appeal
Vintage hollow bodies from the ’50s and ’60s are prized for their tone, craftsmanship, and mojo. However, they can be fragile, expensive, and inconsistent in setup.
Modern Advantages
Today’s guitars benefit from improved materials, better manufacturing tolerances, and enhanced electronics. Many brands now offer “vintage-accurate” specs with modern reliability—giving you the best of both worlds.
Sustainability and Ethical Sourcing
As of 2026, more manufacturers are prioritizing sustainability. Look for brands that use FSC-certified woods, eco-friendly finishes, and ethical labor practices.
While not directly related to tone, supporting responsible companies ensures the craft survives for future generations—and many of these brands also invest in better quality control and innovation.
Frequently Asked Questions
What makes a hollow body guitar ideal for rockabilly?
Hollow body guitars produce a bright, resonant tone with strong midrange presence and natural reverb—perfect for the clean, punchy rhythms and twangy leads that define rockabilly. Their acoustic-like response pairs beautifully with tube amps and slapback echo.
Can semi-hollow guitars work for rockabilly?
Absolutely. Semi-hollow guitars with a center block offer reduced feedback and increased sustain while retaining much of the acoustic character. They’re especially useful for louder gigs or genre-blending styles.
Are Filter’Tron pickups necessary for rockabilly?
While not mandatory, Filter’Trons are the gold standard for rockabilly tone. Their clarity, brightness, and hum-free operation make them ideal for capturing that classic Gretsch-inspired sound.
How important is the Bigsby vibrato?
The Bigsby is iconic in rockabilly for its smooth, subtle pitch modulation. While not essential, it enhances expressiveness and adds visual flair. Just ensure it’s well-set up to avoid tuning issues.
Should I choose a thinline or full-depth hollow body?
Thinline guitars are generally more comfortable, lighter, and feedback-resistant—great for stage work. Full-depth bodies offer more acoustic resonance, ideal for players who prioritize tone over portability.
What wood combination is best for rockabilly?
Maple tops with mahogany bodies strike an ideal balance—bright attack with warm lows. Maple necks add clarity, while rosewood or ebony fingerboards fine-tune the feel and response.
Do I need a tube amp for rockabilly tone?
While solid-state or digital amps can get close, tube amps are preferred for their natural breakup, compression, and dynamic response—especially when paired with spring reverb and echo.
Can I use effects pedals with a rockabilly guitar?
Yes, but sparingly. Reverb, slapback delay, and subtle overdrive can enhance the tone, but the focus should remain on the guitar and amp interaction. Avoid heavy modulation or distortion.
Are expensive hollow body guitars worth it?
Higher-priced models often feature better woods, hand-crafted details, upgraded hardware, and superior electronics. If you’re serious about tone and longevity, the investment pays off.
How do I prevent feedback with a hollow body guitar?
Use moderate gain, position yourself wisely on stage, and consider guitars with feedback baffles or center blocks. EQ’ing out problematic frequencies and using a noise gate can also help.
See Also
- 10 Expert Picks: Hollow Body Electric Guitars for Indie Rock Jangle in 2026
- 10 Expert-Recommended Hollow Body Electric Guitars for Indie Rock in 2026
- 10 Must-Have Hollow Body Electric Guitars for Jazz Trio Gigs in 2026
- Top 10 Premium Hollow Body Electric Guitars Worth the Splurge for Jazz Pros
- Semi-Hollow Body Electric Guitars: The Science Behind Their Singing Sustain