Paul, George, Ringo and George Martin on the White Album.
The Beatles Interviews: Meeting George Martin and Ringo Joining The Band
Legendary Producer George Martin
Sir George Henry Martin was an English record producer, arranger, composer, conductor, audio engineer, and musician. He was referred to as the "Fifth Beatle", including by Paul McCartney, in reference to his extensive involvement on each of the Beatles' original albums. Martin produced 30 number-one hit singles in the United Kingdom and 23 number-one hits in the United States.