What is bass player Stuart Sutcliffe often referred to, thanks to his presence on a band's early demo recordings?
Hello Little Girl:  They recorded a home demo of it, with Stuart Sutcliffe on bass, which is available only on bootleg currently. Stuart Sutcliffe:  As a member of the group when it was a five-piece band, Sutcliffe is one of several people sometimes referred to as the "Fifth Beatle."
Fifth Beatle