A classical acoustic guitar has six strings. There are variations in guitar configurations for creating different sounds, including the electric four-string bass guitar and the 12-string guitar that is played like a six-string but with two strings per note.
The notes on a six-string guitar are tuned to E, A, D, G, B and E. Precisely placed frets along the neck of the instrument mark finger placement for creating a scale of notes in semitone intervals. By depressing the string against the neck of the guitar, the length of string over the sound hole is shorted, and the resulting sound has a higher pitch.
