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The change can be attributed to several factors. One key influence appears to be the legendary Motown bassist James Jamerson, whose melodic and intricate bass lines were prevalent in many popular hits of the time. The Beatles' exposure to the vibrant Motown scene during their tours in the U.S. played a significant role in McCartney's evolving style. The musical landscape was shifting rapidly, and it was clear that McCartney was absorbing new ideas along the way.