Who was the backing vocal and acoustic guitar ?
" : John Lennon – lead vocal , acoustic guitar , piano , backing vocal George Harrison – electric guitar , piano , backing vocal Klaus Voormann – bass guitar , electric piano , backing vocal Alan White – drums , piano , backing vocal Billy Preston – organ , backing vocal Yoko Ono – backing vocal Mal Evans – chimes , handclaps , backing vocal " uncredited " – tambourine Allen Klein and several dozen revellers from London 's Hatchett Club – backing vocals