A 4-string bass is usually tuned to E, A, D & G--one octave below the 4 lowest strings of this
[DOC] [TLE] Bass guitar - Wikipedia [PAR] The bass guitar is a stringed instrument played primarily with the ..... for the 
electric bass guitar has four strings, tuned E, A, D and G, in fourths such that the 
open highest string, G, is an eleventh (an octave and a fourth) below ...