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However, as the band continued to innovate, tensions began to emerge. McCartney's artistic vision often clashed with those of Lennon and Harrison. Their musical evolution was complicated by personal differences and the untimely death of their manager, Brian Epstein, in 1967. Despite these challenges, they produced groundbreaking albums like "Sgt. Pepper's Lonely Hearts Club Band," a hallmark of the '60s counterculture.
By 1969, the chaos within the band grew intolerable. A series of disputes over creative control and the direction of their music took a toll, leading to McCartney's formal announcement of the band's breakup in April 1970.