Question:  Randolph Peter "Pete" Best has been referred to as an informal title with claims first appeared in the press immediately upon the band's rise to what?
Sentence (from "Fifth Beatle"): The fifth Beatle is an informal title that various commentators in the press and entertainment industry have applied to people who were at one point a member of the Beatles, or who had a strong association with the "Fab Four" (John Lennon, Paul McCartney, George Harrison, and Ringo Starr) during the group's existence.
Relevant evidence: Yes