He's called a bassist. Paul McCartney played bass for most of The Beatles recordings and performances, although originally the band's bassist was Stuart Sutcliffe and occasionally George or John would play bass - John played bass on Let It Be as it was recorded live and Paul was playing piano.
A bassist
John Lennon - rhythm guitar, Paul McCartney - bass, George Harrison - lead guitar
The bassist is the person in a band that plays the bass guitar.
if by sings bass you mean a bass player that sings, then paul McCartney with the beatles.
Stuart Sutcliffe was the original bass guitarist for the Beatles. He quit to return to Art school.Yes he did
Bass
Paul McCartney is the famous bass player for The Beatles.
Paul McCartney
Yes, and he sometimes uses it in concert, when he plays Beatles songs. (He had several Hofner basses; one still had a Beatles set list taped to it, years after the band broke up.)
Paul McCartney (bass) and Ringo Starr (drums) are still alive of The Beatles.
A bass Guitarist I would venture to guess that a person who plays the bass guitar is called a "bassist". Calling a person who plays a bass guitar a "guitarist" would also be acceptable. Bass player Bassist Bass guitarist Guitarist is misleading
plays bass! :P