The Surprising Cat Gut Truth Behind Violin Strings

The Fascinating History of Violin Strings

Violin strings have come a long way since the early days of the instrument. While we may take modern violin strings for granted, the material and methods used to create strings have evolved significantly over centuries of violin-making. In fact, some of the earliest violin strings had rather unsavory origins that many modern musicians would find appalling. This article will explore the full history of violin string materials and production from the 16th century to today. We’ll uncover the truth about controversial practices like using cat gut for strings, and shed light on more ethical modern options. By the end, you’ll have a deep understanding of how violin strings came to produce the resonant, beautiful sounds we love today.

Early Violin String Materials

In the early history of the violin, strings were made from animal gut, usually from sheep or goats. According to research from Give’ns Violins, the earliest violin strings from the 16th and 17th centuries were made from sheep gut. The G string specifically was made from cat gut since it provided added strength and stability under tension. The E, A, and D strings continued to be made from sheep gut.

During the Baroque period in the late 1600s and early 1700s, innovations in string making emerged. The G string began to be wound with silver or copper wire which created a fuller, more resonant tone. The addition of metal winding helped support the tension placed on the G string. According to Amorim Fine Violins, it wasn’t until the 1730s that all strings started to be wound with metal. This allowed the creation of lower tuned strings while maintaining playability.

Cat Gut as a Violin String Material

Cat gut was one of the main materials used for violin strings for centuries.[1] To produce catgut violin strings, the intestines of cats were harvested and processed.

The cat intestines went through an extensive preparation process to turn them into usable violin strings. First, they were scraped and soaked in water to remove mucus and fat. Next, they were twisted and stretched while drying to improve their strength. The guts were then polished and sometimes treated with chemicals to control thickness and improve durability.[2]

Cat gut had several advantages as a violin string material. It created strings with great elasticity and durability. The tone produced by cat gut strings was described as warm, mellow, and resonant by violinists. However, cat gut strings were also sensitive to changes in temperature and humidity. They required frequent tuning and changing to maintain good tone.[3]

Overall, cat gut remained a popular choice of violinists for hundreds of years due to its musical properties. However, the material did have downsides in terms of stability and the extensive preparation required.




Other Animal Guts Used

Although cat gut was commonly used for violin strings in the past, other animal guts were also utilized as string material, including sheep, horses, and cows. Sheep gut in particular was frequently employed as an alternative to cat gut.

According to Wikipedia ( Sheep gut is more durable than cat gut and does not soften with moisture as much as cat gut. The trade-off is sheep gut’s less resonant tone compared to other materials. Sheep gut is more translucent compared to cat gut and horses gut.

Horse gut was more popular in France, but had similar properties to sheep gut in terms of durability and tone. Cow gut was also occasionally used, but was not as common as sheep or horse gut.

Overall, while cat gut was the predominant source of string material in past centuries, other animal guts from sheep, horses, and cows offered alternatives with slightly different properties in terms of tone, moisture resistance, and longevity.

Shift from Cat Gut Strings

In the 19th and early 20th century, cat gut remained the dominant material for violin strings. However, steel and synthetic materials started gaining popularity as alternatives. In fact, steel E strings emerged as early as the 1900s as a durable and louder alternative to traditional sheep gut.[1]

The shift away from cat gut strings really accelerated in the 1920s and 1930s. This was driven by scarcity of quality cat gut during World War I, rising costs, and improvements in steel and synthetic technologies. Many violinists switched to metal wound strings, with steel, copper, silver, and other metals used.[1]

According to research, synthetic core strings without any animal gut were first developed in the 1970s under the Dominant brand. These were noted to lack the “tinny” sound quality associated with inferior cat gut strings. The Combination of steel and synthetics offered a more consistent and durable violin string.[2]

So in summary, cat gut violins strings declined in the early 20th century as new materials like steel and synthetics were adopted. These alternatives resolved issues like cost, durability, and sound quality. While cat gut is still used today, it is far less common than centuries past.



Modern Violin String Materials

In today’s violin strings, steel and synthetic materials like nylon and perlon have largely replaced traditional gut strings (What Are Violin Strings Made Of?). Modern violin strings have steel or synthetic cores, which are more durable and stable than animal gut. The core may be wound with different metals to modify the tone.

The most common core materials are (How Violin Strings Are Made Today):

  • Steel – Used for durable and inexpensive strings with a bright, projecting tone.
  • Perlon – A type of nylon that produces warm, mellow tones.
  • Synthetic gut – An alternative to real gut with similar acoustic properties.

These cores are then wrapped with various metals like silver, copper, aluminum, and nickel to tailor the strings’ tone and playability. The metals add mass which allows the string to vibrate more freely. The most common winding metals are (A Guide to Choosing the Right Violin Strings):

  • Silver – Produces a bright, complex tone.
  • Aluminum – Provides brilliance and projection.
  • Nickel – Creates a mellow, muted sound.

The combination of core and winding materials allows modern violin strings to offer a wide range of tones for different playing styles and musical genres.

Do Modern Strings Still Use Cat Gut?

While cat gut was historically used for violin strings, it has become less common in modern times. Synthetic materials like nylon and steel have largely replaced cat gut, especially for student and amateur players. However, cat gut does still have some limited uses today:

Some professional violinists, particularly soloists, prefer the mellow sound quality of authentic cat gut strings. Top brands like Thomastik-Infeld and Pirastro continue to manufacture high-end cat gut strings for discerning musicians. According to Johnson String Instrument, “Many professional violinists still prefer the tone of sheep gut strings” (

Cat gut may also be used in historically informed performances that aim to recreate the sound of Baroque-era violins. The mellow tone provides an authentic sound. However, these niche uses make up only a small portion of the overall string market today.

Impact on Sound

The type of string material impacts the sound quality and tone of the violin. Cat gut strings produce a warmer, darker, and richer sound compared to most modern synthetic materials. The natural gut resonates in a complex way, creating overtones that fill out the sound. Many musicians feel cat gut has more tonal “personality.”

Modern synthetic strings like steel, synthetic gut, and nylon tend to create a brighter and clearer sound. The materials are more uniform in their physical properties, producing fewer overtones. While this can result in a “colder” sound, it offers the benefit of consistent and reliable intonation. Synthetic materials also allow for thinner string diameters while maintaining strength.

There is no universally “best” violin string material. It comes down to musical preference and playing style. Cat gut offers a classic violin sound with nuance and complexity. Synthetic strings provide clarity and precision. Most players today opt for synthetic core strings with wound metal coverings to balance warm tone with responsiveness.

Ethical Concerns

The use of animal-derived materials like catgut for violin strings has raised ethical concerns regarding animal welfare. Catgut is made from the intestinal linings of cows or sheep. While the animals are not killed specifically for their intestines, using these by-products from the meat industry normalizes the consumption of animals and fails to consider their suffering.

Some argue that using all parts of an animal already killed for meat reduces waste. However, animal rights groups like PETA counter that this perpetuates the belief that animals are commodities for human use. They advocate for alternative man-made materials that do not require animal exploitation at all.

Modern violinists can choose synthetic polymer or metal strings that sound similar to gut without harming animals. According to PETA, very few instruments still require animal-derived materials. As effective alternatives become available, violinists and other musicians are encouraged to adopt more ethical practices.


In summary, while cat gut was commonly used for violin strings in the past, modern violin strings today are typically made of steel, synthetic core materials, and various metal windings. The shift away from cat gut occurred as newer materials were developed that provided more consistent, durable, and tunable strings. However, some luthiers and musicians still believe the unique sound qualities of gut strings are preferable for classical repertoire. Though cat gut is no longer the primary violin string material, it played an important role in the evolution of the violin over centuries. As one quote eloquently states: “Four poor strings; yet what an endless row of artists, blessed with Nature’s highest gift, have wrested from them all a human heart can feel of joy and pain.”

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