The classical design of acoustic guitars as we know them today was created in the 19th century in what country?

The familiar shape and resonant sound of the modern acoustic guitar were perfected in the workshop of a 19th-century Spanish luthier named Antonio de Torres Jurado. Often called the "father of the modern guitar," Torres revolutionized the instrument's construction. He increased the size of the guitar's body and, most critically, developed an innovative "fan bracing" pattern for the internal structure of the soundboard. This system of strategically placed wooden struts allowed the top to vibrate more freely.

Before Torres, guitars were generally smaller and quieter, more suited for intimate gatherings than large concert halls. His new design produced a much louder, richer, and more balanced tone with greater sustain and a deeper bass response. This transformed the guitar into a powerful solo instrument capable of filling a performance venue, capturing the attention of composers and performers across Europe.

The acoustic principles established by Torres were so effective that his design quickly became the blueprint for luthiers everywhere. The "Torres model" set the standard for the size, shape, and construction of virtually all classical guitars made since. His work even laid the essential groundwork that would later influence the development of the steel-string acoustic guitar, cementing Spain's central role in the instrument's history.