”4th string on a G-tar”

Errrrrrmmmmm......Tattie, the 4th string on a guitar is ‘D’, ‘G’ is the third string. Guitar strings are listed alphabetically from the thickest to the thinnest - EADGBe - but they are numbered the reverse, from the thinnest - high ‘e’ - to the thickest - low ‘E’.