The acoustic bass guitar (also called ABG or acoustic bass) is a bass instrument with a hollow wooden body similar to, though usually somewhat larger than a steel-string acoustic guitar. Like the traditional electric bass guitar and the double bass, the acoustic bass guitar commonly has four strings, which are normally tuned E-A-D-G, an octave below the lowest four strings of the 6-string guitar, which is the same tuning pitch as an electric bass guitar.