The Fender Bass VI was a six-stringed bass guitar that was John and George's predominantly bass used from 1968 to 1970. It is featured on songs like Back in the USSR, Dig It, The Long and Winding Road, Golden Slumbers, Carry That Weight, Rocky Raccoon, Honey Pie, Oh! Darling, Birthday, Helter Skelter and While My Guitar Gently Weeps to name a few. It was usually used to double a bass part (e.g. Rocky Raccoon, Gently Weeps, etc), to use as chords in a song (e.g. U.S.S.R., Dig It) or to give the song a heavy and chunky bass part (e.g. Helter Skelter, Long and Winding, Birthday, etc).