An acoustic guitar is a musical instrument in the guitar family that introduces the sound of acoustic chords through the air. Originally known simply as a guitar, the retro guitar 'acoustic guitar' was used to distinguish it from the electric guitar, which relies on an electronic amplification system. Sound waves from acoustic guitar chords echo through the instrument's body, amplifying the sound. Typically, the body of the guitar is a sound box, on top of which is a soundboard that amplifies the vibrating sounds of chords. In standard tuning, the six strings of the guitar are tuned (low to high) E2A2D3G3B3E4. Guitar strings can be arranged individually with picks or fingers or flip to play strings. Tying the string vibrates at the basic pitch determined by the length, mass and tension of the string. (There are also overtures, which are closely related to the harmonics of the basic pitch.) Soundboard and wind string vibrate sound through the sound box. Because they have their own resonances, they increase some overtones more strongly than others, resulting in sound timing. Guitar is an ancient instrument whose history dates back to 4000 years. Many theories of instrumental descent have been developed, but modern acoustic guitars have come from a long progression of rigorous musical instruments. Guitar is often said to be the evolution of medieval instrument vihuas derived from ancient veena.
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