This text is an extensive Wikipedia entry providing a comprehensive overview of the life and career of John Lennon, the influential English musician and activist. The article details his personal life, including his birth in Liverpool, his marriages to Cynthia Powell and Yoko Ono, and the complex relationships with his sons, Julian and Sean. Crucially, the source outlines his musical journey from founding The Quarrymen to achieving global fame as a member of The Beatles, highlighting his legendary songwriting partnership with Paul McCartney and his subsequent solo career and political activism. Finally, the text covers his tragic murder in 1980 and his enduring artistic and cultural legacy, including various accolades and memorials.