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Sir Paul McCartney cuts a giant cake modelled on the Liverpool Institute for Performing Arts, watched by Sir George Martin, on Jan. 30, 1996. Martin, the record producer known as the "Fifth Beatle" has died aged 90, Ringo Starr has said on Twitter. (David Kendall/PA Wire/Zuma Press/TNS)

Sir Paul McCartney cuts a giant cake modelled on the Liverpool Institute for Performing Arts, watched by Sir George Martin, on Jan. 30, 1996. Martin, the record producer known as the "Fifth Beatle" has died aged 90, Ringo Starr has said on Twitter. (David Kendall/PA Wire/Zuma Press/TNS)