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The producer's work with The Beatles opened the ears of a young Bob Boilen to the possibilities of a song, and stretched the boundaries of popular music.
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In the studio, the Beatles' longtime producer and arranger devised many of the band's signature sounds. He died Tuesday at age 90.
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The classically trained composer was the Beatles' closest collaborator throughout the 1960s, producing virtually all their music. Music critics agree they wouldn't have been the Beatles without him.