The guitar is a plucked string instrument, usually played with fingers or a pick. It consists of the body and rigid neck with strings attached to it generally they are six in number. Mostly, guitars are traditionally built with various types of woods. In recent times, guitars have been constructed using steel strings or nylon. Other modern guitars are made of polycarbonate materials. People who construct guitars and repair them are known as Luthiers. Generally, there are two types of guitars in existence .i.e. electric and acoustic. Acoustic guitars generally have a hollow body. However, acoustic guitars are further divide into three type’s namely classical guitars, archtop guitar and steel-string acoustic guitars. The tone of an acoustic guitar can be produced through the vibration of the strings. The tone is then amplified by the body of the guitar that acts as a resonator. Classical guitar is a sole instrument that uses all-inclusive finger picking skills.
On the other hand, electric guitars depend on an amplifier which manipulates tone electronically. Electronic guitars came in to replace the hollow acoustic guitars. In recent times, electronic guitars have gain much popularity compared to hollow acoustic guitars. So, how is sound produced by a guitar? Sound is produced through the vibration of the strings. Since a string displaces less amount of air, the pitch and the volume is amplified by the bodies of the guitar. The acoustic guitar uses a resonator cavity, sound box and a soundboard to attain a high volume. The body of a guitar has hollow part that amplifies the sound. When strings vibrates, the sound produced is directed towards the hollow board through the bridge and making it vibrate. The soundboard is bigger and thus displaces a larger volume of air thereby amplifying the sound compared to the strings alone.
What follows is that the sound board vibrates and sound waves are produced from both faces of the soundboard via the bridge. The sound box improves and gives the soundboard a support by resonation of the sound and reflection of the waves produced back to the soundboard. From the resonating cavity, the air resonates with the vibrations produced by the strings and thereby increasing the pitch and the volume of the sound. The back face of the guitar also vibrates slightly because it gets driven by the air in the resonating cavity. The sound hole in the guitar produces the sound produced. Some of the guitars are made without the sound hole but instead they are made with the f hole for instance the violin. The sound from the sound hole is mixed with the sound produced at the soundboard face. The result of it is a combination of harmonies that gives a guitar its distinctive sound. This process continues after every notation. The guitar player presses or plucks the strings in different combinations to produce several notations and different sounds. With this continues production of notations, different harmonies are produced and finally a certain rhythm is acquired. From this, musicians can now play along with the guitar in their desired harmonies.