Final answer:
The 'beginning of the end' for The Beatles is attributed to several factors, but the 1967 death of their manager, Brian Epstein, marked a significant turning point that contributed to the band's eventual split.
Step-by-step explanation:
The Beatles were an iconic British rock band that defined a generation, but they were not impervious to troubles which eventually led to their break-up. The 'beginning of the end' for The Beatles is often attributed to several factors, with no one single event pinpointed as the sole cause. However, a key tragic moment that had a profound effect on the group was the death of their manager, Brian Epstein, in 1967. Epstein's passing left the band without the business and personal guidance that had helped them navigate the complexities of fame and success.
After his death, internal conflicts, business disputes, and artistic differences grew more pronounced, leading to a decline in the group's cohesiveness. Additionally, the diverging artistic paths of the members, with John Lennon's increasing involvement with Yoko Ono for example, added to the tension within the band. Although they continued to create music for a few more years after Epstein's death, by 1970, The Beatles had officially disbanded.