Bass guitar
The standard design for the electric bass guitar has four strings, generally tuned E, A, D and G (low to high). It is not uncommon for players to tune strings to a lower pitch, particularly in styles, such as heavy metal, that favor deeper sounds. Five string basses add a lower string, usually tuned to B, while six-string-basses add a higher string tuned to C. In standard tunings, each string is tuned a perfect fourth interval above the next lower string (e.g. E to A).