The classic guitar differs from the other types of guitars first of all because it is an acoustic instrument. The sound is amplified by a sound box. It has six strings. There are some classical guitars that have eight or more strings, in order to expand the bass scale, and to allow lute music written for lutes with more than six courses of strings to be played. One other original element are the strings that are made from catgut (made from sheep intestine, despite the name). Sometimes, much more commonly these days, they are made of nylon, as opposed to the metal strings found in some other forms of guitar. These strings have a significantly lower tension than steel strings. The lower three strings (bass strings) are commonly made of silver or nickel. In less common stringing, they use a fourth wound string. Because of the low tension of the strings the neck can be made only of wood and they do not require a steel truss rod.
For this guitar, the neck is broader than that of steel string guitars, making more complex work easier. However, it requires a left hand position that makes the guitar less stable and easy to hold. Usually, the strings are plucked with the fingers. Serious players shape their fingernails in such a way that their contact the string in a certain way can help them to achieve the desired tone.
The tuning pegs (or "keys") at the head the fingerboard of a classical guitar point, traditionally, towards the player when the guitar is in playing position. This is in contrast to a steel-string guitar, in which the tuning pegs point up and down from playing position.
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