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Tributes to the record producer known as the Fifth Beatle, Sir George Martin, are placed at The Cavern on Wednesday in Liverpool following his death at age 90. (Peter Byrne/PA Wire/Zuma Press/TNS)

Tributes to the record producer known as the Fifth Beatle, Sir George Martin, are placed at The Cavern on Wednesday in Liverpool following his death at age 90. (Peter Byrne/PA Wire/Zuma Press/TNS)