Paul McCartney, Ringo Starr and Sean Ono Lennon remember Beatles producer George Martin

Producer George Martin, known for his collaboration with the Beatles, died Tuesday at the age of 90, sparking remembrances on social media for the man known as "the fifth Beatle."

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Paul McCartney on George Martin: 'I'm so sad...'

Appreciation George Martin's indispensable role with the Beatles

Video: Watch George Martin cruise through L.A. to talk 'God Only Knows' with Brian Wilson