When we think about the guitar, it’s easy to focus on the instrument itself. The shape of the body, the feel of the neck, the pickups, the bridge and, of course, the player.
But without one small and often overlooked component, none of it would matter: the strings.
Guitar strings have changed dramatically over the centuries. What started with natural animal materials has evolved into the sophisticated range of steel, nickel, bronze, phosphor bronze, nylon and other materials available to guitarists today.
The history of guitar strings is closely tied to the history of the guitar itself. As guitars became louder, more versatile and more widely available, strings had to evolve alongside them.
So, where did it all begin?
The Early Days: Gut Strings
The earliest stringed instruments date back thousands of years, long before the modern guitar existed. Ancient musicians used a variety of natural materials to make strings, including plant fibres, silk and animal materials.
One of the most important developments was the use of animal gut, usually made from the intestines of sheep or other livestock.
Despite sometimes being referred to as “catgut”, genuine cat intestines were not normally the source. The name is thought to have a more complicated history, and sheep gut became one of the most common materials used for musical strings.
Gut strings were used on many early stringed instruments, including lutes, viols and the ancestors of the modern guitar.
Gut had some useful characteristics. It was relatively flexible and produced a warm, mellow tone that suited the instruments of the time.
However, it wasn’t perfect.
Gut strings could be affected by temperature and humidity, were prone to stretching and could break relatively easily. They also required considerable care during manufacture.
Nevertheless, gut strings remained the standard for centuries.
The Guitar Takes Shape
During the 16th and 17th centuries, various instruments resembling what we would recognise as a guitar began to develop.
The Renaissance guitar and later the Baroque guitar typically used gut strings. These instruments were considerably smaller and quieter than many modern guitars.
By the 18th and 19th centuries, the guitar was developing towards its modern form. The number of strings, tuning systems and construction methods changed, eventually leading to the six-string classical guitar we know today.
The strings continued to be predominantly made from gut.
By the 19th century, however, guitar makers and musicians were looking for ways to produce more volume and projection.
That would eventually lead to one of the biggest changes in string history.
The Rise of Steel Strings
Steel strings had existed in various forms before they became commonplace on guitars, but their widespread adoption was closely connected to developments in instrument design during the 19th and early 20th centuries.
Steel offered a major advantage over gut: greater tension and increased volume.
This made steel strings particularly useful for instruments that needed to compete with other musicians in larger ensembles.
However, simply putting steel strings on an instrument designed for gut could cause serious problems. Steel strings exert considerably more tension, so guitars had to be strengthened and redesigned to cope with them.
This was one of the reasons steel-string guitars developed their own construction methods.
Manufacturers such as C. F. Martin & Co. played an important role in the development of steel-string acoustic guitars.
As steel-string guitars became increasingly popular, the sound of the guitar changed too.
Compared with gut, steel strings could produce a brighter, louder and more projecting sound. This made them ideal for folk, country, blues and eventually many other styles of popular music.
Silk and Steel: A Softer Alternative
Not every guitarist wanted the high tension and bright sound of traditional steel strings.
One interesting development was the silk-and-steel string.
These strings use a steel core combined with silk or another softer material. They produce less tension and tend to have a softer, more delicate sound than conventional steel strings.
Silk-and-steel strings are still available today and can be particularly appealing to fingerstyle players or anyone looking for a gentler feel.
The Birth of Nylon Strings
While steel strings were becoming increasingly important for acoustic guitars, another major development was taking place in the world of classical guitar.
The Second World War created significant difficulties in obtaining traditional gut strings. Musicians and manufacturers therefore began looking for alternatives.
One of the most important breakthroughs came from nylon.
Nylon was developed commercially in the 1930s and began being used for musical strings in the 1940s.
The classical guitarist Andrés Segovia played an important role in popularising nylon strings, working with string manufacturer Albert Augustine to develop suitable nylon guitar strings.
Nylon strings offered several advantages. They were more consistent than gut, less affected by environmental changes and easier to manufacture reliably.
Most importantly, they sounded excellent.
The modern classical guitar consequently became closely associated with nylon strings.
Today, classical and flamenco guitars generally use nylon or similar synthetic strings, although the bass strings are usually made differently from the treble strings.
What Are Modern Classical Guitar Strings Made From?
Modern nylon guitar strings aren’t necessarily made entirely from nylon.
The three highest strings — usually E, B and G — are commonly made from a solid synthetic material such as nylon or a similar polymer.
The lower three bass strings have a synthetic core wrapped with metal wire.
Different manufacturers use different materials and construction methods, including composite and fluorocarbon trebles.
This gives players a surprisingly wide range of tonal options even within the world of classical guitar strings.
The Electric Guitar Changes Everything
The development of the electric guitar in the 1930s and 1940s created another major requirement for guitar strings.
Electric guitars rely on magnetic pickups, which detect the movement of magnetic material.
This meant that ordinary non-magnetic strings weren’t particularly useful for conventional magnetic electric-guitar pickups.
The solution was to use strings containing magnetic metals, most commonly steel, often with a nickel wrapping.
This gave rise to the electric guitar strings that are familiar to players today.
The development of electric guitar strings helped make entirely new sounds possible.
Players could now combine the natural resonance of a vibrating string with amplification, effects and increasingly powerful equipment.
Blues, rock ‘n’ roll, jazz, rock, metal and countless other genres would all benefit from this development.
Roundwound vs Flatwound Strings
As electric guitar playing developed, manufacturers experimented with different ways of wrapping strings.
Two of the most important designs are roundwound and flatwound.
Roundwound strings use a round wire wrapped around the core. They tend to have a brighter tone, more sustain and a more pronounced feel under the fingers.
Flatwound strings use a flatter wrapping wire, creating a smoother surface.
They generally have a warmer, darker sound and are strongly associated with jazz guitar, although they have been used in many other styles.
There is also a middle ground: half-round, groundwound and similar designs, which aim to combine some characteristics of both.
Nickel, Stainless Steel and Beyond
Modern electric guitar strings are available in a huge variety of materials.
Nickel-plated steel is perhaps one of the most popular choices. It offers a balance between brightness, warmth and durability.
Pure nickel strings have a warmer, more vintage-style character and are often chosen by players looking for an old-school sound.
Stainless steel strings tend to be brighter and can offer excellent resistance to corrosion, although they can feel different under the fingers.
There are also strings made with other alloys and specialised coatings, each designed to alter the tone, feel, longevity or combination of all three.
The Development of Coated Strings
One of the more recent developments in guitar-string technology is the coated string.
Traditional guitar strings can gradually lose their brightness as dirt, sweat and oils from our hands build up around the winding.
Manufacturers began developing extremely thin protective coatings designed to reduce the amount of contamination reaching the metal.
The result is a string that can retain its tone for considerably longer.
Coated strings aren’t universally loved. Some players prefer the feel and tone of traditional uncoated strings, while others appreciate the longer lifespan.
As with almost everything relating to guitar, it ultimately comes down to personal preference.
Guitar String Gauges
The materials used to make strings aren’t the only thing that has changed.
Players today can also choose from an enormous range of string gauges.
Gauge refers to the thickness of the string, normally measured in thousandths of an inch.
For electric guitar, a typical set might range from something like .009–.042 through to much heavier gauges such as .011–.052 or beyond.
Lighter strings generally feel easier to bend and can be more comfortable for some players. Heavier strings can provide a fuller feel and may work particularly well for lower tunings or players who prefer more resistance.
Acoustic guitars also have their own range of gauges, from extra-light sets through to heavy strings.
There isn’t really a “correct” gauge.
The best choice depends on your guitar, tuning, playing style and personal preference.
Modern Guitar Strings
Today, guitarists have more choice than ever.
You can buy:
- Nylon classical strings
- Fluorocarbon classical strings
- Silk-and-steel strings
- Phosphor bronze acoustic strings
- 80/20 bronze acoustic strings
- Nickel-plated electric strings
- Pure nickel strings
- Stainless steel strings
- Flatwound strings
- Coated strings
- Extended-range and specialist strings
- Strings designed specifically for altered and low tunings
Manufacturers such as D’Addario, Ernie Ball, Elixir Strings, DR Handmade Strings and GHS Strings have all helped develop the enormous range of strings available to guitarists.
The modern guitarist can choose strings based not just on gauge, but on material, construction, coating, winding method and intended style of music.
What’s Next for Guitar Strings?
It’s difficult to predict exactly where guitar strings will go next.
String technology has already come a remarkably long way, from natural gut strings made by hand to highly engineered products manufactured to extremely precise tolerances.
Modern manufacturers continue to experiment with new alloys, synthetic materials, coatings and construction techniques.
There is also growing interest in sustainability and the environmental impact of manufacturing musical instruments and accessories. That could lead to further changes in the materials used to make guitar strings in the years ahead.
What is unlikely to change is the importance of the humble guitar string.
Whether you’re playing a 16th-century-inspired lute, a vintage Stratocaster, a modern acoustic or a seven-string metal guitar, the strings are where the sound begins.
From Gut to Modern Day
The history of guitar strings is really the history of musicians looking for a better way to make music.
Gut strings gave early guitars their voice. Steel brought greater volume and projection. Nylon transformed the classical guitar. Magnetic steel strings made the electric guitar possible. And modern materials and coatings have given players more choice than ever before.
It’s easy to take a packet of guitar strings for granted.
But the next time you restring your guitar, it’s worth remembering just how much history is sitting in your hands.
From animal gut to advanced alloys and synthetic materials, guitar strings have spent centuries evolving alongside the instrument itself.
And considering how much innovation has happened already, it seems likely that the story of the guitar string isn’t finished yet.
