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The guitar is a musical instrument and is most recognized in popular culture as the primary instrument in blues, country, flamenco, pop, and rock music. The guitar has six strings, but guitars with four, seven, eight, ten, and twelve strings are being commonplace. Guitars are made and repaired by artisans and craftsmen known as luthiers.
An acoustic guitar is not dependent on any external device for amplification. The shape and resonance of the guitar itself creates acoustic amplification. However, the unamplified guitar is not a loud instrument. It cannot compete with other instruments commonly found in bands and orchestras, in terms of sheer audible volume. Many acoustic guitars are available today with built-in electronics and power to enable amplification.
There are several subcategories within the acoustic guitar group: steel string guitars, which includes the flat top, or "folk" guitar, the closely related twelve string guitar, and the arch top guitar. A recent arrival in the acoustic guitar group is the acoustic bass guitar, similar in tuning to the electric bass.
Electric guitars can have solid, semi-hollow, or hollow bodies, and produce little sound without amplification. Electromagnetic pickups (single and double coil) convert the vibration of the steel strings into electrical signals which are fed to an amplifier through a cable or radio transmitter. The sound is frequently modified by other electronic devices or the natural distortion of valves (vacuum tubes) in the amplifier. The electric guitar is used extensively in jazz, blues and rock and roll, and was commercialized by Gibson together with Les Paul and independently by Leo Fender.