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One standout example is "I Saw Her Standing There," often referenced for its catchiness and rhythm. However, McCartney himself admitted to borrowing the bass line from Chuck Berry's "I'm Talking About You," marking it as an early instance where he followed an existing musical idea rather than creating something wholly original.
A Turning Point with Rubber Soul
The pivotal moment in McCartney's bass playing came with song number 68, when Rubber Soul was released. The opening track immediately signaled a shift; the music was infused with a newfound vitality and complexity. McCartney’s bass lines became rhythmically active and adventurous, diverging from the safe confines of root and fifth note playing.