acoustic guitar
A guitar that produces sound naturally through its hollow wooden body without electronic amplification.
In Depth
The acoustic guitar amplifies string vibrations through its hollow body, with the soundboard (top) acting as the primary resonator. Steel-string acoustics produce a bright, projecting tone suited to folk, country, and pop. Classical guitars use nylon strings for a warmer, softer sound suited to classical and flamenco music.
The acoustic guitar's portability and versatility made it the most popular instrument of the 20th century. From Robert Johnson's Delta blues to Bob Dylan's protest folk to Ed Sheeran's loop-pedal pop, the acoustic guitar has accompanied virtually every genre. Its intimate, direct sound makes it the natural choice for singer-songwriters.
The most expensive acoustic guitar ever sold was a Martin D-45 owned by John Lennon, which fetched .4 million at auction — more than most Stradivarius violins.