George Martin, legendary music producer and composer, has died at age 90. 

Martin, known as the "fifth Beatle" produced and arranged most of The Beatles songs we know and love.  

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Aside from The Beatles, he also produced albums for Ella Fitzgerald, Celine Dion, Elton John, Cheap Trick, Kenny Rodgers, Jimmy Webb and many more.  

Guinness World Records named George Martin as the most successful producer ever, with more than 50 number one hit records over 50 years in the United States and Great Britain.

Metro looks back at Martin's career in photos an examines rare interview footage of the legendary producer discussing the making of some of The Beatles' classic records.