A guitar with 12 strings grouped in pairs, instead of the normal 6 strings spaced apart from each other. Strings in each given pair are either tuned an octave apart or to the same pitch, and played simultaneously. There are also 12 string bass guitar
s, where the same principle is applied to a standard 4-string bass guitar, yielding an instrument with four groups of 3 strings each.
The guitar player thought that the next song called for a fuller, richer guitar sound, so he put down his regular guitar and picked up his 12 string.