Why did guitars become important instruments in folk and popular music?

The guitar became a cornerstone of folk and popular music primarily due to its versatility and the evolution of its projection capabilities. Historically, the instrument grew in popularity during the 17th century as the lute and vihuela declined, eventually becoming a staple in the folk traditions of many countries.1

In popular music, the guitar's prominence was significantly bolstered by the invention of the electric guitar in 1931. During the 1920s and 1930s, acoustic guitarists struggled to be heard over the brass and reed sections of large jazz ensembles. The development of electrical amplification solved this issue, allowing the instrument to compete in volume and projection within noisy venues and large bands.2

This technological advancement enabled the guitar to evolve from a rhythm instrument into a powerful solo voice, shaping genres such as urban blues, rhythm and blues, and rock and roll. Beyond its sonic utility, the electric guitar became a cultural symbol, particularly for the youth movements of the 1950s and 1960s.2